Transmission device with channel equalization and control and methods for use therewith

ABSTRACT

Aspects of the subject disclosure may include, for example, a transmission device that includes at least one transceiver configured to modulate data to generate a plurality of first electromagnetic waves in accordance with channel control parameters. A plurality of couplers are configured to couple at least a portion of the plurality of first electromagnetic waves to a transmission medium, wherein the plurality of couplers generate a plurality of second electromagnetic waves that propagate along the outer surface of the transmission medium. A training controller is configured to generate the channel control parameters based on channel state information received from at least one remote transmission device. Other embodiments are disclosed.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of and claims priority to U.S. patentapplication Ser. No. 15/095,029, filed Apr. 9, 2016, which is acontinuation of and claims priority to U.S. patent application Ser. No.14/548,429 filed Nov. 20, 2014. The contents of the foregoing are herebyincorporated by reference into this application as if set forth hereinin full.

FIELD OF THE DISCLOSURE

The subject disclosure relates to communications via microwavetransmission in a communication network.

BACKGROUND

As smart phones and other portable devices increasingly becomeubiquitous, and data usage increases, macrocell base station devices andexisting wireless infrastructure in turn require higher bandwidthcapability in order to address the increased demand. To provideadditional mobile bandwidth, small cell deployment is being pursued,with microcells and picocells providing coverage for much smaller areasthan traditional macrocells.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram illustrating an example, non-limitingembodiment of a guided wave communications system in accordance withvarious aspects described herein.

FIG. 2 is a block diagram illustrating an example, non-limitingembodiment of a dielectric waveguide coupler in accordance with variousaspects described herein.

FIG. 3 is a block diagram illustrating an example, non-limitingembodiment of a dielectric waveguide coupler in accordance with variousaspects described herein.

FIG. 4 is a block diagram illustrating an example, non-limitingembodiment of a dielectric waveguide coupler in accordance with variousaspects described herein.

FIGS. 5A and 5B are block diagrams illustrating example, non-limitingembodiments of a dielectric waveguide coupler and transceiver inaccordance with various aspects described herein.

FIG. 6 is a block diagram illustrating an example, non-limitingembodiment of a dual dielectric waveguide coupler in accordance withvarious aspects described herein.

FIG. 7 is a block diagram illustrating an example, non-limitingembodiment of a bidirectional dielectric waveguide coupler in accordancewith various aspects described herein.

FIG. 8 illustrates a block diagram illustrating an example, non-limitingembodiment of a bidirectional dielectric waveguide coupler in accordancewith various aspects described herein.

FIG. 9 illustrates a block diagram illustrating an example, non-limitingembodiment of a bidirectional repeater system in accordance with variousaspects described herein.

FIG. 10 illustrates a flow diagram of an example, non-limitingembodiment of a method for transmitting a transmission with a dielectricwaveguide coupler as described herein.

FIG. 11 is a block diagram of an example, non-limiting embodiment of acomputing environment in accordance with various aspects describedherein.

FIG. 12 is a block diagram of an example, non-limiting embodiment of amobile network platform in accordance with various aspects describedherein.

FIGS. 13a, 13b, and 13c are block diagrams illustrating example,non-limiting embodiments of a slotted waveguide coupler in accordancewith various aspects described herein.

FIGS. 14a and 14b are a block diagrams illustrating an example,non-limiting embodiment of a waveguide coupling system in accordancewith various aspects described herein.

FIG. 15 is a block diagram illustrating an example, non-limitingembodiment of a guided wave communication system in accordance withvarious aspects described herein.

FIG. 16 is a block diagram illustrating an example, non-limitingembodiment of a transmission device in accordance with various aspectsdescribed herein.

FIG. 17 is a diagram illustrating an example, non-limiting embodiment ofan electromagnetic distribution in accordance with various aspectsdescribed herein.

FIG. 18 is a diagram illustrating an example, non-limiting embodiment ofan electromagnetic distribution in accordance with various aspectsdescribed herein.

FIG. 19 is a block diagram illustrating an example, non-limitingembodiment of a transmission device in accordance with various aspectsdescribed herein.

FIG. 20 is a block diagram of an example, non-limiting embodiment of atransmission device in accordance with various aspects described herein.

FIG. 21 is a diagram illustrating example, non-limiting embodiments ofelectromagnetic distributions in accordance with various aspectsdescribed herein.

FIG. 22 is a diagram illustrating example, non-limiting embodiments ofpropagation patterns in accordance with various aspects describedherein.

FIG. 23 is a diagram illustrating example, non-limiting embodiments ofelectromagnetic distributions in accordance with various aspectsdescribed herein.

FIG. 24 is a block diagram illustrating an example, non-limitingembodiment of a guided wave communication system in accordance withvarious aspects described herein.

FIG. 25 is a diagram illustrating an example, non-limiting embodiment ofchannel parameters in accordance with various aspects described herein.

FIG. 26 illustrates a flow diagram of an example, non-limitingembodiment of a method as described herein.

FIG. 27 illustrates a flow diagram of an example, non-limitingembodiment of a method as described herein.

DETAILED DESCRIPTION

One or more embodiments are now described with reference to thedrawings, wherein like reference numerals are used to refer to likeelements throughout. In the following description, for purposes ofexplanation, numerous details are set forth in order to provide athorough understanding of the various embodiments. It is evident,however, that the various embodiments can be practiced in differentcombinations and without these details (and without applying to anyparticular networked environment or standard).

To provide network connectivity to additional base station devices, thebackhaul network that links the communication cells (e.g., macrocellsand macrocells) to network devices of the core network correspondinglyexpands. Similarly, to provide network connectivity to a distributedantenna system, an extended communication system that links base stationdevices and their distributed antennas is desirable. A guided wavecommunication system can be provided to enable alternative, increased oradditional network connectivity and a waveguide coupling system can beprovided to transmit and/or receive guided wave (e.g., surface wave)communications on a transmission medium, such as a wire or otherconductor that operates as a single-wire transmission line or adielectric material that operates as a waveguide and/or anothertransmission medium that otherwise operates to guide the transmission ofan electromagnetic wave.

In an example embodiment, a waveguide coupler that is utilized in awaveguide coupling system can be made of a dielectric material, or otherlow-loss insulator (e.g., Teflon, polyethylene, etc.), or can be made ofa conducting (e.g., metallic, non-metallic, etc.) material, or anycombination of the foregoing materials. Reference throughout thedetailed description to “dielectric waveguide” is for illustrationpurposes and does not limit embodiments to being constructed solely ofdielectric materials. In other embodiments, other dielectric orinsulating materials are possible. It will be appreciated that a varietyof transmission media such as: wires, whether insulated or not, andwhether single-stranded or multi-stranded; conductors of other shapes orconfigurations including wire bundles, cables, rods, rails, pipes;non-conductors such as dielectric pipes, rods, rails, or otherdielectric members; combinations of conductors and dielectric materials;or other guided wave transmission media can be utilized with guided wavecommunications without departing from example embodiments.

For these and/or other considerations, in one or more embodiments, atransmission device includes a communications interface that receives afirst communication signal that includes first data. A transceivergenerates a first electromagnetic wave based on the first communicationsignal to convey the first data, the first electromagnetic wave havingat least one carrier frequency and at least one correspondingwavelength. A coupler couples the first electromagnetic wave to atransmission medium having at least one inner portion surrounded by adielectric material, the dielectric material having an outer surface anda corresponding circumference, wherein the coupling of the firstelectromagnetic wave to the transmission medium forms a secondelectromagnetic wave that is guided to propagate along the outer surfaceof the dielectric material via at least one guided wave mode thatincludes an asymmetric mode, wherein the at least one carrier frequencyis within a millimeter wave frequency band and wherein the at least onecorresponding wavelength is less than the circumference of thetransmission medium.

In one or more embodiments, a transmission device includes a transmitterthat generates a first electromagnetic wave based on a communicationsignal to convey data, the first electromagnetic wave having at leastone carrier frequency and at least one corresponding wavelength. Acoupler couples the first electromagnetic wave to a single wiretransmission medium having an outer surface and a correspondingcircumference, wherein the coupling of the first electromagnetic wave tothe single wire transmission medium forms a second electromagnetic wavethat is guided to propagate along the outer surface of the single wiretransmission medium via at least one guided wave mode that includes anasymmetric mode, wherein the at least one carrier frequency in within amillimeter wave frequency band and wherein the at least onecorresponding wavelength is less than the circumference of the singlewire transmission medium.

In one or more embodiments, a method includes generating a firstelectromagnetic wave based on a communication signal to convey data, thefirst electromagnetic wave having at least one carrier frequency and atleast one corresponding wavelength. A coupler couples the firstelectromagnetic wave to a single wire transmission medium having anouter dielectric surface and a corresponding circumference, wherein thecoupling of the first electromagnetic wave to the single wiretransmission medium forms a second electromagnetic wave that is guidedto propagate along the outer dielectric surface of the single wiretransmission medium via at least one guided wave mode, wherein the atleast one carrier frequency is within a millimeter wave frequency bandand wherein the at least one corresponding wavelength is less than thecircumference of the single wire transmission medium.

In one or more embodiments, a transmission device includes acommunications interface that receives a first communication signal thatincludes first data. A transceiver generates a first electromagneticwave based on the first communication signal to convey the first data,the first electromagnetic wave having at least one carrier frequency. Acoupler couples the first electromagnetic wave to a transmission mediumhaving at least one inner portion surrounded by a dielectric material,the dielectric material having an outer surface and a correspondingcircumference, wherein the coupling of the first electromagnetic wave tothe transmission medium forms a second electromagnetic wave that isguided to propagate along the outer surface of the dielectric materialvia at least one guided wave mode that includes an asymmetric modehaving a lower cutoff frequency, and wherein the at least one carrierfrequency is selected to be within a limited range of the lower cutofffrequency.

Various embodiments described herein relate to a transmission system forlaunching and extracting guided wave (e.g., surface wave communicationsthat are electromagnetic waves) transmissions from a wire. Atmillimeter-wave frequencies, wherein the wavelength is small compared tothe size of the equipment, transmissions can propagate as waves guidedby a waveguide, such as a strip or length of dielectric material orother coupler. The electromagnetic field structure of the guided wavecan be inside and/or outside of the coupler. When this coupler isbrought into close proximity to a transmission medium (e.g., a wire,utility line or other transmission medium), at least a portion of theguided wave decouples from the waveguide and couples to the transmissionmedium, and continues to propagate as guided waves, such as surfacewaves about the surface of the wire.

In one or more embodiments, a coupler includes a receiving portion thatreceives a first electromagnetic wave conveying first data from atransmitting device. A guiding portion guides the first electromagneticwave to a junction for coupling the first electromagnetic wave to atransmission medium. The first electromagnetic wave propagates via atleast one first guided wave mode. The coupling of the firstelectromagnetic wave to the transmission medium forms a secondelectromagnetic wave that is guided to propagate along the outer surfaceof the transmission medium via at least one second guided wave mode thatdiffers from the at least one first guided wave mode.

In one or more embodiments, a coupling module includes a plurality ofreceiving portions that receive a corresponding plurality of firstelectromagnetic waves conveying first data. A plurality of guidingportions guide the plurality of first electromagnetic waves to acorresponding plurality of junctions for coupling the plurality of firstelectromagnetic waves to a transmission medium. The plurality of firstelectromagnetic waves propagate via at least one first guided wave modeand the coupling of the plurality of first electromagnetic waves to thetransmission medium forms a plurality of second electromagnetic wavesthat are guided to propagate along the outer surface of the transmissionmedium via at least one second guided wave mode that differs from the atleast one first guided wave mode.

In one or more embodiments, a transmission device includes at least onetransceiver configured to modulate data to generate a plurality of firstelectromagnetic waves. A plurality of couplers are configured to coupleat least a portion of the plurality of first electromagnetic waves to atransmission medium, wherein the plurality of couplers generate aplurality of mode division multiplexed second electromagnetic waves thatpropagate along the outer surface of the transmission medium. Forexample, the plurality of second electromagnetic waves can propagatealong the outer surface of the transmission medium via differing ones ofa plurality of guided wave modes.

In one or more embodiments, a transmission device includes at least onetransceiver configured to modulate data to generate a plurality of firstelectromagnetic waves in accordance with channel control parameters. Aplurality of couplers are configured to couple at least a portion of theplurality of first electromagnetic waves to a transmission medium,wherein the plurality of couplers generate a plurality of secondelectromagnetic waves that propagate along the outer surface of thetransmission medium. A training controller is configured to generate thechannel control parameters based on channel state information receivedfrom at least one remote transmission device.

According to an example embodiment, the electromagnetic wave is asurface wave, which is a type of guided wave that is guided by a surfaceof the transmission medium, which can include an exterior or outersurface of the wire, exterior or outer surface of a dielectric coatingor insulating jacket, or another surface of a transmission medium thatis adjacent to or exposed to another type of medium having differentproperties (e.g., dielectric properties). Indeed, in an exampleembodiment, a surface of the transmission that guides a surface wave canrepresent a transitional surface between two different types of media.For example, in the case of a bare or uninsulated wire, the surface ofthe wire can be the outer or exterior conductive surface of the bare oruninsulated wire that is exposed to air or free space. As anotherexample, in the case of insulated wire, the surface of the wire can bethe conductive portion of the wire that meets the insulator portion ofthe wire, or can otherwise be the insulated surface of the wire that isexposed to air or free space, or can otherwise be any material regionbetween the insulated surface of the wire and the conductive portion ofthe wire that meets the insulator portion of the wire, depending uponthe relative differences in the properties (e.g., dielectric properties)of the insulator, air, and/or the conductor and further dependent on thefrequency and propagation mode or modes of the guided wave.

According to an example embodiment, guided waves such as surface wavescan be contrasted with radio transmissions over free space/air orconventional propagation of electrical power or signals through theconductor of the wire. Indeed, with surface wave or guided wave systemsdescribed herein, conventional electrical power or signals can stillpropagate or be transmitted through the conductor of the wire, whileguided waves (including surface waves and other electromagnetic waves)can surround all or part of the surface of the wire and propagate alongthe wire with low loss, according to an example embodiment. In anexample embodiment, a surface wave can have a field structure (e.g., anelectromagnetic field structure) that lies primarily or substantiallyoutside of the transmission medium that serves to guide the surfacewave.

In an example embodiment, the guided waves employed herein can becontrasted with Sommerfeld waves used as a means of propagation along awire which are limited to waves having a wavelength greater than, notless than, the circumference of the wire. In an example embodiment, theguided waves employed herein can be contrasted with G-Wave and E-Wavesystems that operate via the propagation of the fundamental mode and notbased on the propagation of at least one asymmetric mode. In an exampleembodiment, the guided waves employed herein can be contrasted withsurface plasmon wave propagation along single metal wire premised on theelectron bunches that form in conductors at frequencies such as opticalfrequencies, well above, and not less than γ, the mean collisionfrequency of electrons of the conducting material. These prior artsystems have failed to address guided wave propagation for atransmission medium, where the guided wave includes an asymmetric modethat propagates at low loss frequencies, such as in the millimeter waveband, that are less than the mean collision frequency of electrons ofthe conducting material. These prior art systems have failed to addressguided wave propagation for a transmission medium that includes an outerdielectric, where the guided wave includes an asymmetric mode thatpropagates with low loss with fields concentrated about the outersurface of the dielectric.

According to an example embodiment, the electromagnetic waves travelingalong a wire are induced by other electromagnetic waves traveling alonga waveguide in proximity to the wire. The inducement of theelectromagnetic waves can be independent of any electrical potential,charge or current that is injected or otherwise transmitted through thewires as part of an electrical circuit. It is to be appreciated thatwhile a small current in the wire may be formed in response to thepropagation of the electromagnetic wave through the wire, this can bedue to the propagation of the electromagnetic wave along the wiresurface, and is not formed in response to electrical potential, chargeor current that is injected into the wire as part of an electricalcircuit. The electromagnetic waves traveling on the wire therefore donot require a circuit to propagate along the wire surface. The wiretherefore is a single wire transmission line that does not require acircuit. Also, in some embodiments, a wire is not necessary, and theelectromagnetic waves can propagate along a single line transmissionmedium that is not a wire.

According to an example embodiment, the term “single wire transmissionmedium” is used in conjunction with transmission via electromagneticwaves that are guided by a wire, but do not require the wire to be partof a circuit to support such propagation. A transmission system mayinclude multiple single wire transmission media that act to transmitsuch guided waves, with different waves being guided by differing onesof the single wire transmission media.

According to an example embodiment, the term “about” a wire used inconjunction with a guided wave (e.g., surface wave) can includefundamental wave propagation modes and other guided waves having acircular or substantially circular field distribution (e.g., electricfield, magnetic field, electromagnetic field, etc.) at least partiallyaround a wire. In addition, when a guided wave propagates “about” awire, it propagates longitudinally along the wire via a wave propagationmode (at least one guided wave mode) that can include not only thefundamental wave propagation modes (e.g., zero order modes), butadditionally or alternatively other non-fundamental wave propagationmodes such as higher-order guided wave modes (e.g., 1^(st) order modes,2^(nd) order modes, etc.), asymmetrical modes and/or other guided (e.g.,surface) waves that have non-circular field distributions around a wire.

For example, such non-circular field distributions can be unilateral ormulti-lateral with one or more azimuthal lobes characterized byrelatively higher field strength and/or one or more nulls or nullregions characterized by relatively low-field strength, zero-fieldstrength or substantially zero field strength. Further, the fielddistribution can otherwise vary as a function of a longitudinalazimuthal orientation around the wire such that one or more regions ofazimuthal orientation around the wire have an electric or magnetic fieldstrength (or combination thereof) that is higher than one or more otherregions of azimuthal orientation, according to an example embodiment. Itwill be appreciated that the relative positions of the higher ordermodes or asymmetrical modes can vary as the guided wave travels alongthe wire.

Referring now to FIG. 1, a block diagram illustrating an example,non-limiting embodiment of a guided wave communication system 100 isshown. Guided wave communication system 100 depicts an exemplaryenvironment in which a transmission device, coupler or coupling modulecan be used.

Guided wave communication system 100 can be a distributed antenna systemthat includes one or more base station devices (e.g., base stationdevice 104) that are communicably coupled to a macrocell site 102 orother network connection. Base station device 104 can be connected by awired (e.g., fiber and/or cable), or by a wireless (e.g., microwavewireless) connection to macrocell site 102. Macrocells such as macrocellsite 102 can have dedicated connections to the mobile network and basestation device 104 can share and/or otherwise use macrocell site 102'sconnection. Base station device 104 can be mounted on, or attached to,utility pole 116. In other embodiments, base station device 104 can benear transformers and/or other locations situated nearby a power line.

Base station device 104 can facilitate connectivity to a mobile networkfor mobile devices 122 and 124. Antennas 112 and 114, mounted on or nearutility poles 118 and 120, respectively, can receive signals from basestation device 104 and transmit those signals to mobile devices 122 and124 over a much wider area than if the antennas 112 and 114 were locatedat or near base station device 104.

It is noted that FIG. 1 displays three utility poles, with one basestation device, for purposes of simplicity. In other embodiments,utility pole 116 can have more base station devices, and one or moreutility poles with distributed antennas are possible.

A transmission device, such as dielectric waveguide coupling device 106can transmit the signal from base station device 104 to antennas 112 and114 via utility or power line(s) that connect the utility poles 116,118, and 120. To transmit the signal, radio source and/or coupler 106upconverts the signal (e.g., via frequency mixing) from base stationdevice 104 or otherwise converts the signal from the base station device104 to a millimeter-wave band signal having at least one carrierfrequency in the millimeter wave frequency band. The dielectricwaveguide coupling device 106 launches a millimeter-wave band wave thatpropagates as a guided wave (e.g., surface wave or other electromagneticwave) traveling along the utility line or other wire. At utility pole118, another transmission device, such as dielectric waveguide couplingdevice 108 that receives the guided wave (and optionally can amplify itas needed or desired or operate as a digital repeater to receive it andregenerate it) and sends it forward as a guided wave (e.g., surface waveor other electromagnetic wave) on the utility line or other wire. Thedielectric waveguide coupling device 108 can also extract a signal fromthe millimeter-wave band guided wave and shift it down in frequency orotherwise convert it to its original cellular band frequency (e.g., 1.9GHz or other defined cellular frequency) or another cellular (ornon-cellular) band frequency. An antenna 112 can transmit (e.g.,wirelessly transmit) the downshifted signal to mobile device 122. Theprocess can be repeated by another transmission device, such asdielectric waveguide coupling device 110, antenna 114 and mobile device124, as necessary or desirable.

Transmissions from mobile devices 122 and 124 can also be received byantennas 112 and 114 respectively. Repeaters on dielectric waveguidecoupling devices 108 and 110 can upshift or otherwise convert thecellular band signals to millimeter-wave band and transmit the signalsas guided wave (e.g., surface wave or other electromagnetic wave)transmissions over the power line(s) to base station device 104.

In an example embodiment, system 100 can employ diversity paths, wheretwo or more utility lines or other wires are strung between the utilitypoles 116, 118, and 120 (e.g., two or more wires between poles 116 and120) and redundant transmissions from base station 104 are transmittedas guided waves down the surface of the utility lines or other wires.The utility lines or other wires can be either insulated or uninsulated,and depending on the environmental conditions that cause transmissionlosses, the coupling devices can selectively receive signals from theinsulated or uninsulated utility lines or other wires. The selection canbe based on measurements of the signal-to-noise ratio of the wires, orbased on determined weather/environmental conditions (e.g., moisturedetectors, weather forecasts, etc.). The use of diversity paths withsystem 100 can enable alternate routing capabilities, load balancing,increased load handling, concurrent bi-directional or synchronouscommunications, spread spectrum communications, etc. (See FIG. 8 formore illustrative details).

It is noted that the use of the dielectric waveguide coupling devices106, 108, and 110 in FIG. 1 are by way of example only, and that inother embodiments, other uses are possible. For instance, dielectricwaveguide coupling devices can be used in a backhaul communicationsystem, providing network connectivity to base station devices.Dielectric waveguide coupling devices can be used in many circumstanceswhere it is desirable to transmit guided wave communications over awire, whether insulated or not insulated. Dielectric waveguide couplingdevices are improvements over other coupling devices due to no contactor limited physical and/or electrical contact with the wires that maycarry high voltages. With dielectric waveguide coupling devices, theapparatus can be located away from the wire (e.g., spaced apart from thewire) and/or located on the wire so long as it is not electrically incontact with the wire, as the dielectric acts as an insulator, allowingfor cheap, easy, and/or less complex installation. However, aspreviously noted conducting or non-dielectric couplers can be employed,particularly in configurations where the wires correspond to a telephonenetwork, cable television network, broadband data service, fiber opticcommunications system or other network employing low voltages or havinginsulated transmission lines.

It is further noted, that while base station device 104 and macrocellsite 102 are illustrated in an example embodiment, other networkconfigurations are likewise possible. For example, devices such asaccess points or other wireless gateways can be employed in a similarfashion to extend the reach of other networks such as a wireless localarea network, a wireless personal area network or other wireless networkthat operates in accordance with a communication protocol such as a802.11 protocol, WIMAX protocol, UltraWideband protocol, Bluetoothprotocol, Zigbee protocol or other wireless protocol.

Turning now to FIG. 2, illustrated is a block diagram of an example,non-limiting embodiment of a dielectric waveguide coupling system 200 inaccordance with various aspects described herein. System 200 comprises adielectric waveguide 204 that has a wave 206 propagating as a guidedwave about a waveguide surface of the dielectric waveguide 204. In anexample embodiment, the dielectric waveguide 204 is curved, and at leasta portion of the dielectric waveguide 204 can be placed near a wire 202in order to facilitate coupling between the dielectric waveguide 204 andthe wire 202, as described herein. The dielectric waveguide 204 can beplaced such that a portion of the curved dielectric waveguide 204 isparallel or substantially parallel to the wire 202. The portion of thedielectric waveguide 204 that is parallel to the wire can be an apex ofthe curve, or any point where a tangent of the curve is parallel to thewire 202. When the dielectric waveguide 204 is positioned or placedthusly, the wave 206 travelling along the dielectric waveguide 204couples, at least in part, to the wire 202, and propagates as guidedwave 208 around or about the wire surface of the wire 202 andlongitudinally along the wire 202. The guided wave 208 can becharacterized as a surface wave or other electromagnetic wave, althoughother types of guided waves 208 can be supported as well withoutdeparting from example embodiments. A portion of the wave 206 that doesnot couple to the wire 202 propagates as wave 210 along the dielectricwaveguide 204. It will be appreciated that the dielectric waveguide 204can be configured and arranged in a variety of positions in relation tothe wire 202 to achieve a desired level of coupling or non-coupling ofthe wave 206 to the wire 202. For example, the curvature and/or lengthof the dielectric waveguide 204 that is parallel or substantiallyparallel, as well as its separation distance (which can include zeroseparation distance in an example embodiment), to the wire 202 can bevaried without departing from example embodiments. Likewise, thearrangement of the dielectric waveguide 204 in relation to the wire 202may be varied based upon considerations of the respective intrinsiccharacteristics (e.g., thickness, composition, electromagneticproperties, etc.) of the wire 202 and the dielectric waveguide 204, aswell as the characteristics (e.g., frequency, energy level, etc.) of thewaves 206 and 208.

The guided wave 208 propagates in a direction parallel or substantiallyparallel to the wire 202, even as the wire 202 bends and flexes. Bendsin the wire 202 can increase transmission losses, which are alsodependent on wire diameters, frequency, and materials. If the dimensionsof the dielectric waveguide 204 are chosen for efficient power transfer,most of the power in the wave 206 is transferred to the wire 202, withlittle power remaining in wave 210. It will be appreciated that theguided wave 208 can still be multi-modal in nature (discussed herein),including having modes that are non-fundamental or asymmetric, whiletraveling along a path that is parallel or substantially parallel to thewire 202, with or without a fundamental transmission mode. In an exampleembodiment, non-fundamental or asymmetric modes can be utilized tominimize transmission losses and/or obtain increased propagationdistances.

It is noted that the term parallel is generally a geometric constructwhich often is not exactly achievable in real systems. Accordingly, theterm parallel as utilized in the subject disclosure represents anapproximation rather than an exact configuration when used to describeembodiments disclosed in the subject disclosure. In an exampleembodiment, substantially parallel can include approximations that arewithin 30 degrees of true parallel in all dimensions.

In an example embodiment, the wave 206 can exhibit one or more wavepropagation modes. The dielectric waveguide modes can be dependent onthe shape and/or design of the dielectric waveguide 204. The one or moredielectric waveguide modes of wave 206 can generate, influence, orimpact one or more wave propagation modes of the guided wave 208propagating along wire 202. In an example embodiment, the wavepropagation modes on the wire 202 can be similar to the dielectricwaveguide modes since both waves 206 and 208 propagate about the outsideof the dielectric waveguide 204 and wire 202 respectively. In someembodiments, as the wave 206 couples to the wire 202, the modes canchange form due to the coupling between the dielectric waveguide 204 andthe wire 202. For example, differences in size, material, and/orimpedances of the dielectric waveguide 204 and the wire 202 may createadditional modes not present in the dielectric waveguide modes and/orsuppress some of the dielectric waveguide modes. The wave propagationmodes can comprise the fundamental transverse electromagnetic mode(Quasi-TEM₀₀), where only small electric and/or magnetic fields extendin the direction of propagation, and the electric and magnetic fieldsextend radially outwards while the guided wave propagates along thewire. This guided wave mode can be donut shaped, where few of theelectromagnetic fields exist within the dielectric waveguide 204 or wire202. Waves 206 and 208 can comprise a fundamental TEM mode where thefields extend radially outwards, and also comprise other,non-fundamental (e.g., asymmetric, higher-level, etc.) modes. Whileparticular wave propagation modes are discussed above, other wavepropagation modes are likewise possible such as transverse electric (TE)and transverse magnetic (TM) modes, based on the frequencies employed,the design of the dielectric waveguide 204, the dimensions andcomposition of the wire 202, as well as its surface characteristics, itsoptional insulation, the electromagnetic properties of the surroundingenvironment, etc. It should be noted that, depending on the frequency,the electrical and physical characteristics of the wire 202 and theparticular wave propagation modes that are generated, the guided wave208 can travel along the conductive surface of an oxidized uninsulatedwire, an unoxidized uninsulated wire, an insulated wire and/or along theinsulating surface of an insulated wire.

In an example embodiment, a diameter of the dielectric waveguide 204 issmaller than the diameter of the wire 202. For the millimeter-bandwavelength being used, the dielectric waveguide 204 supports a singlewaveguide mode that makes up wave 206. This single waveguide mode canchange as it couples to the wire 202 as surface wave 208. If thedielectric waveguide 204 were larger, more than one waveguide mode canbe supported, but these additional waveguide modes may not couple to thewire 202 as efficiently, and higher coupling losses can result. However,in some alternative embodiments, the diameter of the dielectricwaveguide 204 can be equal to or larger than the diameter of the wire202, for example, where higher coupling losses are desirable or whenused in conjunction with other techniques to otherwise reduce couplinglosses (e.g., impedance matching with tapering, etc.).

In an example embodiment, the wavelength of the waves 206 and 208 arecomparable in size, or smaller than a circumference of the dielectricwaveguide 204 and the wire 202. In an example, if the wire 202 has adiameter of 0.5 cm, and a corresponding circumference of around 1.5 cm,the wavelength of the transmission is around 1.5 cm or less,corresponding to a frequency of 20 GHz or greater. In anotherembodiment, a suitable frequency of the transmission and thecarrier-wave signal is in the range of 30-100 GHz, perhaps around 30-60GHz, and around 38 GHz in one example. In an example embodiment, whenthe circumference of the dielectric waveguide 204 and wire 202 iscomparable in size to, or greater, than a wavelength of thetransmission, the waves 206 and 208 can exhibit multiple wavepropagation modes including fundamental and/or non-fundamental(symmetric and/or asymmetric) modes that propagate over sufficientdistances to support various communication systems described herein. Thewaves 206 and 208 can therefore comprise more than one type of electricand magnetic field configuration. In an example embodiment, as theguided wave 208 propagates down the wire 202, the electrical andmagnetic field configurations will remain the same from end to end ofthe wire 202. In other embodiments, as the guided wave 208 encountersinterference or loses energy due to transmission losses, the electricand magnetic field configurations can change as the guided wave 208propagates down wire 202.

In an example embodiment, the dielectric waveguide 204 can be composedof nylon, Teflon, polyethylene, a polyamide, or other plastics. In otherembodiments, other dielectric materials are possible. The wire surfaceof wire 202 can be metallic with either a bare metallic surface, or canbe insulated using plastic, dielectric, insulator or other sheathing. Inan example embodiment, a dielectric or otherwisenon-conducting/insulated waveguide can be paired with either abare/metallic wire or insulated wire. In other embodiments, a metallicand/or conductive waveguide can be paired with a bare/metallic wire orinsulated wire. In an example embodiment, an oxidation layer on the baremetallic surface of the wire 202 (e.g., resulting from exposure of thebare metallic surface to oxygen/air) can also provide insulating ordielectric properties similar to those provided by some insulators orsheathings.

It is noted that the graphical representations of waves 206, 208 and 210are presented merely to illustrate the principles that wave 206 inducesor otherwise launches a guided wave 208 on a wire 202 that operates, forexample, as a single wire transmission line. Wave 210 represents theportion of wave 206 that remains on the dielectric waveguide 204 afterthe generation of guided wave 208. The actual electric and magneticfields generated as a result of such wave propagation may vary dependingon the frequencies employed, the particular wave propagation mode ormodes, the design of the dielectric waveguide 204, the dimensions andcomposition of the wire 202, as well as its surface characteristics, itsoptional insulation, the electromagnetic properties of the surroundingenvironment, etc.

It is noted that dielectric waveguide 204 can include a terminationcircuit or damper 214 at the end of the dielectric waveguide 204 thatcan absorb leftover radiation or energy from wave 210. The terminationcircuit or damper 214 can prevent and/or minimize the leftover radiationfrom wave 210 reflecting back toward transmitter circuit 212. In anexample embodiment, the termination circuit or damper 214 can includetermination resistors, and/or other components that perform impedancematching to attenuate reflection. In some embodiments, if the couplingefficiencies are high enough, and/or wave 210 is sufficiently small, itmay not be necessary to use a termination circuit or damper 214. For thesake of simplicity, these transmitter and termination circuits ordampers 212 and 214 are not depicted in the other figures, but in thoseembodiments, transmitter and termination circuits or dampers maypossibly be used.

Further, while a single dielectric waveguide 204 is presented thatgenerates a single guided wave 208, multiple dielectric waveguides 204placed at different points along the wire 202 and/or at differentazimuthal orientations about the wire can be employed to generate andreceive multiple guided waves 208 at the same or different frequencies,at the same or different phases, and/or at the same or different wavepropagation modes. The guided wave or waves 208 can be modulated toconvey data via a modulation technique such as phase shift keying,frequency shift keying, quadrature amplitude modulation, amplitudemodulation, multi-carrier modulation and via multiple access techniquessuch as frequency division multiplexing, time division multiplexing,code division multiplexing, multiplexing via differing wave propagationmodes and via other modulation and access strategies.

Turning now to FIG. 3, illustrated is a block diagram of an example,non-limiting embodiment of a dielectric waveguide coupling system 300 inaccordance with various aspects described herein. System 300 implementsa coupler that comprises a dielectric waveguide 304 and a wire 302 thathas a wave 306 propagating as a guided wave about a wire surface of thewire 302. In an example embodiment, the wave 306 can be characterized asa surface wave or other electromagnetic wave.

In an example embodiment, the dielectric waveguide 304 is curved orotherwise has a curvature, and can be placed near a wire 302 such that aportion of the curved dielectric waveguide 304 is parallel orsubstantially parallel to the wire 302. The portion of the dielectricwaveguide 304 that is parallel to the wire can be an apex of the curve,or any point where a tangent of the curve is parallel to the wire 302.When the dielectric waveguide 304 is near the wire, the guided wave 306travelling along the wire 302 can couple to the dielectric waveguide 304and propagate as guided wave 308 about the dielectric waveguide 304. Aportion of the guided wave 306 that does not couple to the dielectricwaveguide 304 propagates as guided wave 310 (e.g., surface wave or otherelectromagnetic wave) along the wire 302.

The guided waves 306 and 308 stay parallel to the wire 302 anddielectric waveguide 304, respectively, even as the wire 302 anddielectric waveguide 304 bend and flex. Bends can increase transmissionlosses, which are also dependent on wire diameters, frequency, andmaterials. If the dimensions of the dielectric waveguide 304 are chosenfor efficient power transfer, most of the energy in the guided wave 306is coupled to the dielectric waveguide 304 and little remains in guidedwave 310.

In an example embodiment, a receiver circuit can be placed on the end ofwaveguide 304 in order to receive wave 308. A termination circuit can beplaced on the opposite end of the waveguide 304 in order to receiveguided waves traveling in the opposite direction to guided wave 306 thatcouple to the waveguide 304. The termination circuit would thus preventand/or minimize reflections being received by the receiver circuit. Ifthe reflections are small, the termination circuit may not be necessary.

It is noted that the dielectric waveguide 304 can be configured suchthat selected polarizations of the surface wave 306 are coupled to thedielectric waveguide 304 as guided wave 308. For instance, if guidedwave 306 is made up of guided waves or wave propagation modes withrespective polarizations, dielectric waveguide 304 can be configured toreceive one or more guided waves of selected polarization(s). Guidedwave 308 that couples to the dielectric waveguide 304 is thus the set ofguided waves that correspond to one or more of the selectedpolarization(s), and further guided wave 310 can comprise the guidedwaves that do not match the selected polarization(s).

The dielectric waveguide 304 can be configured to receive guided wavesof a particular polarization based on an angle/rotation around the wire302 that the dielectric waveguide 304 is placed (the azimuthalorientation of the coupler) and the azimuthal pattern of the fieldstructure of the guided waves. For instance, if the coupler is orientedto feed the guided waves along the horizontal access and if the guidedwave 306 is polarized horizontally (i.e., the filed structure of theguided waves are concentrated on the horizontal axis), most of theguided wave 306 transfers to the dielectric waveguide as wave 308. Inanother instance, if the dielectric waveguide 304 is rotated 90 degreesaround the wire 302, most of the energy from guided wave 306 wouldremain coupled to the wire as guided wave 310, and only a small portionwould couple to the wire 302 as wave 308.

It is noted that waves 306, 308, and 310 are shown using three circularsymbols in FIG. 3 and in other figures in the specification. Thesesymbols are used to represent a general guided wave, but do not implythat the waves 306, 308, and 310 are necessarily circularly polarized orotherwise circularly oriented. In fact, waves 306, 308, and 310 cancomprise a fundamental TEM mode where the fields extend radiallyoutwards, and also comprise other, non-fundamental (e.g. higher-level,etc.) modes. These modes can be asymmetric (e.g., radial, bilateral,trilateral, quadrilateral, etc,) in nature as well.

It is noted also that guided wave communications over wires can be fullduplex, allowing simultaneous communications in both directions. Wavestraveling one direction can pass through waves traveling in an oppositedirection. Electromagnetic fields may cancel out at certain points andfor short times due to the superposition principle as applied to waves.The waves traveling in opposite directions propagate as if the otherwaves weren't there, but the composite effect to an observer may be astationary standing wave pattern. As the guided waves pass through eachother and are no longer in a state of superposition, the interferencesubsides. As a guided wave (e.g., surface wave or other electromagneticwave) couples to a waveguide and moves away from the wire, anyinterference due to other guided waves (e.g., surface waves or otherelectromagnetic waves) decreases. In an example embodiment, as guidedwave 306 (e.g., surface wave or other electromagnetic wave) approachesdielectric waveguide 304, another guided wave (e.g., surface wave orother electromagnetic wave) (not shown) traveling from left to right onthe wire 302 passes by causing local interference. As guided wave 306couples to dielectric waveguide 304 as wave 308, and moves away from thewire 302, any interference due to the passing guided wave subsides.

It is noted that the graphical representations of electromagnetic waves306, 308 and 310 are presented merely to illustrate the principles thatguided wave 306 induces or otherwise launches a wave 308 on a dielectricwaveguide 304. Guided wave 310 represents the portion of guided wave 306that remains on the wire 302 after the generation of wave 308. Theactual electric and magnetic fields generated as a result of such guidedwave propagation may vary depending on one or more of the shape and/ordesign of the dielectric waveguide, the relative position of thedielectric waveguide to the wire, the frequencies employed, the designof the dielectric waveguide 304, the dimensions and composition of thewire 302, as well as its surface characteristics, its optionalinsulation, the electromagnetic properties of the surroundingenvironment, etc.

Turning now to FIG. 4, illustrated is a block diagram of an example,non-limiting embodiment of a dielectric waveguide coupling system 400 inaccordance with various aspects described herein. System 400 implementsa coupler that comprises a dielectric waveguide 404 that has a wave 406propagating as a guided wave about a waveguide surface of the dielectricwaveguide 404. In an example embodiment, the dielectric waveguide 404 iscurved, and an end of the dielectric waveguide 404 can be tied,fastened, or otherwise mechanically coupled to a wire 402. When the endof the dielectric waveguide 404 is fastened to the wire 402, the end ofthe dielectric waveguide 404 is parallel or substantially parallel tothe wire 402. Alternatively, another portion of the dielectric waveguidebeyond an end can be fastened or coupled to wire 402 such that thefastened or coupled portion is parallel or substantially parallel to thewire 402. The coupling device 410 can be a nylon cable tie or other typeof non-conducting/dielectric material that is either separate from thedielectric waveguide 404 or constructed as an integrated component ofthe dielectric waveguide 404. In other embodiments, the dielectricwaveguide 404 can be mechanically uncoupled from the wire 402 leaving anair gap between the coupler and the wire 402. The dielectric waveguide404 can be adjacent to the wire 402 without surrounding the wire 402.

When the dielectric waveguide 404 is placed with the end parallel to thewire 402, the guided wave 406 travelling along the dielectric waveguide404 couples to the wire 402, and propagates as guided wave 408 about thewire surface of the wire 402. In an example embodiment, the guided wave408 can be characterized as a surface wave or other electromagneticwave.

It is noted that the graphical representations of waves 406 and 408 arepresented merely to illustrate the principles that wave 406 induces orotherwise launches a guided wave 408 on a wire 402 that operates, forexample, as a single wire transmission line. The actual electric andmagnetic fields generated as a result of such wave propagation may varydepending on one or more of the shape and/or design of the dielectricwaveguide, the relative position of the dielectric waveguide to thewire, the frequencies employed, the design of the dielectric waveguide404, the dimensions and composition of the wire 402, as well as itssurface characteristics, its optional insulation, the electromagneticproperties of the surrounding environment, etc.

In an example embodiment, an end of dielectric waveguide 404 can tapertowards the wire 402 in order to increase coupling efficiencies. Indeed,the tapering of the end of the dielectric waveguide 404 can provideimpedance matching to the wire 402, according to an example embodimentof the subject disclosure. For example, an end of the dielectricwaveguide 404 can be gradually tapered in order to obtain a desiredlevel of coupling between waves 406 and 408 as illustrated in FIG. 4.

In an example embodiment, the coupling device 410 can be placed suchthat there is a short length of the dielectric waveguide 404 between thecoupling device 410 and an end of the dielectric waveguide 404. Maximumcoupling efficiencies are realized when the length of the end of thedielectric waveguide 404 that is beyond the coupling device 410 is atleast several wavelengths long for whatever frequency is beingtransmitted, however shorter lengths are also possible.

Turning now to FIG. 5A, illustrated is a block diagram of an example,non-limiting embodiment of a dielectric waveguide coupler andtransceiver system 500 (referred to herein collectively as system 500)in accordance with various aspects described herein. System 500comprises a transmitter/receiver device 506 that launches and receiveswaves (e.g., guided wave 504 onto dielectric waveguide 502). The guidedwaves 504 can be used to transport signals received from and sent to abase station 520, mobile devices 522, or a building 524 by way of acommunications interface 501. The communications interface 501 can be anintegral part of system 500. Alternatively, the communications interface501 can be tethered to system 500. The communications interface 501 cancomprise a wireless interface for interfacing to the base station 520,the mobile devices 522, or building 524 utilizing any of variouswireless signaling protocols (e.g., LTE, WiFi, WiMAX, IEEE 802.xx,etc.). The communications interface 501 can also comprise a wiredinterface such as a fiber optic line, coaxial cable, twisted pair, orother suitable wired mediums for transmitting signals to the basestation 520 or building 524. For embodiments where system 500 functionsas a repeater, the communications interface 501 may not be necessary.

The output signals (e.g., Tx) of the communications interface 501 can becombined with a millimeter-wave carrier wave generated by a localoscillator 512 at frequency mixer 510. Frequency mixer 512 can useheterodyning techniques or other frequency shifting techniques tofrequency shift the output signals from communications interface 501.For example, signals sent to and from the communications interface 501can be modulated signals such as orthogonal frequency divisionmultiplexed (OFDM) signals formatted in accordance with a Long-TermEvolution (LTE) wireless protocol or other wireless 3G, 4G, 5G or highervoice and data protocol, a Zigbee, WIMAX, UltraWideband or IEEE 802.11wireless protocol or other wireless protocol. In an example embodiment,this frequency conversion can be done in the analog domain, and as aresult, the frequency shifting can be done without regard to the type ofcommunications protocol that the base station 520, mobile devices 522,or in-building devices 524 use. As new communications technologies aredeveloped, the communications interface 501 can be upgraded or replacedand the frequency shifting and transmission apparatus can remain,simplifying upgrades. The carrier wave can then be sent to a poweramplifier (“PA”) 514 and can be transmitted via the transmitter receiverdevice 506 via the diplexer 516.

Signals received from the transmitter/receiver device 506 that aredirected towards the communications interface 501 can be separated fromother signals via diplexer 516. The transmission can then be sent to lownoise amplifier (“LNA”) 518 for amplification. A frequency mixer 521,with help from local oscillator 512 can downshift the transmission(which is in the millimeter-wave band or around 38 GHz in someembodiments) to the native frequency. The communications interface 501can then receive the transmission at an input port (Rx).

In an embodiment, transmitter/receiver device 506 can include acylindrical or non-cylindrical metal (which, for example, can be hollowin an embodiment, but not necessarily drawn to scale) or otherconducting or non-conducting waveguide and an end of the dielectricwaveguide 502 can be placed in or in proximity to the waveguide or thetransmitter/receiver device 506 such that when the transmitter/receiverdevice 506 generates a transmission, the guided wave couples todielectric waveguide 502 and propagates as a guided wave 504 about thewaveguide surface of the dielectric waveguide 502. In some embodiments,the guided wave 504 can propagate in part on the outer surface of thedielectric waveguide 502 and in part inside the dielectric waveguide502. In other embodiments, the guided wave 504 can propagatesubstantially or completely on the outer surface of the dielectricwaveguide 502. In yet other embodiments, the guided wave 504 canpropagate substantially or completely inside the dielectric waveguide502. In this latter embodiment, the guide wave 504 can radiate at an endof the dielectric waveguide 502 (such as the tapered end shown in FIG.4) for coupling to a transmission medium such as a wire 402 of FIG. 4.Similarly, if guided wave 504 is incoming (coupled to the dielectricwaveguide 502 from a wire), guided wave 504 then enters thetransmitter/receiver device 506 and couples to the cylindrical waveguideor conducting waveguide. While transmitter/receiver device 506 is shownto include a separate waveguide—an antenna, cavity resonator, klystron,magnetron, travelling wave tube, or other radiating element can beemployed to induce a guided wave on the waveguide 502, without theseparate waveguide.

In an embodiment, dielectric waveguide 502 can be wholly constructed ofa dielectric material (or another suitable insulating material), withoutany metallic or otherwise conducting materials therein. Dielectricwaveguide 502 can be composed of nylon, Teflon, polyethylene, apolyamide, other plastics, or other materials that are non-conductingand suitable for facilitating transmission of electromagnetic waves atleast in part on an outer surface of such materials. In anotherembodiment, dielectric waveguide 502 can include a core that isconducting/metallic, and have an exterior dielectric surface. Similarly,a transmission medium that couples to the dielectric waveguide 502 forpropagating electromagnetic waves induced by the dielectric waveguide502 or for supplying electromagnetic waves to the dielectric waveguide502 can be wholly constructed of a dielectric material (or anothersuitable insulating material), without any metallic or otherwiseconducting materials therein.

It is noted that although FIG. 5A shows that the opening of transmitterreceiver device 506 is much wider than the dielectric waveguide 502,this is not to scale, and that in other embodiments the width of thedielectric waveguide 502 is comparable or slightly smaller than theopening of the hollow waveguide. It is also not shown, but in anembodiment, an end of the waveguide 502 that is inserted into thetransmitter/receiver device 506 tapers down in order to reducereflection and increase coupling efficiencies.

The transmitter/receiver device 506 can be communicably coupled to acommunications interface 501, and alternatively, transmitter/receiverdevice 506 can also be communicably coupled to the one or moredistributed antennas 112 and 114 shown in FIG. 1. In other embodiments,transmitter receiver device 506 can comprise part of a repeater systemfor a backhaul network.

Before coupling to the dielectric waveguide 502, the one or morewaveguide modes of the guided wave generated by the transmitter/receiverdevice 506 can couple to the dielectric waveguide 502 to induce one ormore wave propagation modes of the guided wave 504. The wave propagationmodes of the guided wave 504 can be different than the hollow metalwaveguide modes due to the different characteristics of the hollow metalwaveguide and the dielectric waveguide. For instance, wave propagationmodes of the guide wave 504 can comprise the fundamental transverseelectromagnetic mode (Quasi-TEM₀₀), where only small electrical and/ormagnetic fields extend in the direction of propagation, and the electricand magnetic fields extend radially outwards from the dielectricwaveguide 502 while the guided waves propagate along the dielectricwaveguide 502. The fundamental transverse electromagnetic mode wavepropagation mode may not exist inside a waveguide that is hollow.Therefore, the hollow metal waveguide modes that are used bytransmitter/receiver device 506 are waveguide modes that can coupleeffectively and efficiently to wave propagation modes of dielectricwaveguide 502.

It will be appreciated that other constructs or combinations of thetransmitter/receiver device 506 and dielectric waveguide 502 arepossible. For example, a dielectric waveguide 502′ can be placedtangentially or in parallel (with or without a gap) with respect to anouter surface of the hollow metal waveguide of the transmitter/receiverdevice 506′ (corresponding circuitry not shown) as depicted by reference500′ of FIG. 5B. In another embodiment, not shown by reference 500′, thedielectric waveguide 502′ can be placed inside the hollow metalwaveguide of the transmitter/receiver device 506′ without an axis of thedielectric waveguide 502′ being coaxially aligned with an axis of thehollow metal waveguide of the transmitter/receiver device 506′. Ineither of these embodiments, the guided wave generated by thetransmitter/receiver device 506′ can couple to a surface of thedielectric waveguide 502′ to induce one or more wave propagation modesof the guided wave 504′ on the dielectric waveguide 502′ including afundamental mode (e.g., a symmetric mode) and/or a non-fundamental mode(e.g., asymmetric mode).

In one embodiment, the guided wave 504′ can propagate in part on theouter surface of the dielectric waveguide 502′ and in part inside thedielectric waveguide 502′. In another embodiment, the guided wave 504′can propagate substantially or completely on the outer surface of thedielectric waveguide 502′. In yet other embodiments, the guided wave504′ can propagate substantially or completely inside the dielectricwaveguide 502′. In this latter embodiment, the guide wave 504′ canradiate at an end of the dielectric waveguide 502′ (such as the taperedend shown in FIG. 4) for coupling to a transmission medium such as awire 402 of FIG. 4.

It will be further appreciated that other constructs thetransmitter/receiver device 506 are possible. For example, a hollowmetal waveguide of a transmitter/receiver device 506″ (correspondingcircuitry not shown), depicted in FIG. 5B as reference 500″, can beplaced tangentially or in parallel (with or without a gap) with respectto an outer surface of a transmission medium such as the wire 402 ofFIG. 4 without the use of the dielectric waveguide 502. In thisembodiment, the guided wave generated by the transmitter/receiver device506″ can couple to a surface of the wire 402 to induce one or more wavepropagation modes of a guided wave 408 on the wire 402 including afundamental mode (e.g., a symmetric mode) and/or a non-fundamental mode(e.g., asymmetric mode). In another embodiment, the wire 402 can bepositioned inside a hollow metal waveguide of a transmitter/receiverdevice 506′″ (corresponding circuitry not shown) so that an axis of thewire 402 is coaxially (or not coaxially) aligned with an axis of thehollow metal waveguide without the use of the dielectric waveguide502—see FIGS. 5B reference 500′″, also see FIGS. 10A-10C describedbelow. In this embodiment, the guided wave generated by thetransmitter/receiver device 506′″ can couple to a surface of the wire402 to induce one or more wave propagation modes of a guided wave 408 onthe wire including a fundamental mode (e.g., a symmetric mode) and/or anon-fundamental mode (e.g., asymmetric mode).

In the embodiments of 500″ and 500′″, the guided wave 408 can propagatein part on the outer surface of the wire 402 and in part inside the wire402. In another embodiment, the guided wave 408 can propagatesubstantially or completely on the outer surface of the wire 402. Thewire 402 can be a bare conductor or a conductor with an insulated outersurface.

Turning now to FIG. 6, illustrated is a block diagram illustrating anexample, non-limiting embodiment of a dual dielectric waveguide couplingsystem 600 in accordance with various aspects described herein. In anexample embodiment, a coupling module is shown with two or moredielectric waveguides (e.g., 604 and 606) positioned around a wire 602in order to receive guided wave 608. In an example embodiment, theguided wave 608 can be characterized as a surface wave or otherelectromagnetic wave. In an example embodiment, one dielectric waveguideis enough to receive the guided wave 608. In that case, guided wave 608couples to dielectric waveguide 604 and propagates as guided wave 610.If the field structure of the guided wave 608 oscillates or undulatesaround the wire 602 due to various outside factors, then dielectricwaveguide 606 can be placed such that guided wave 608 couples todielectric waveguide 606. In some embodiments, four or more dielectricwaveguides can be placed around a portion of the wire 602, e.g., at 90degrees or another spacing with respect to each other, in order toreceive guided waves that may oscillate or rotate around the wire 602,that have been induced at different azimuthal orientations or that havenon-fundamental or higher order modes that, for example, have lobesand/or nulls or other asymmetries that are orientation dependent.However, it will be appreciated that there may be less than or more thanfour dielectric waveguides placed around a portion of the wire 602without departing from example embodiments. It will also be appreciatedthat while some example embodiments have presented a plurality ofdielectric waveguides around at least a portion of a wire 602, thisplurality of dielectric waveguides can also be considered as part of asingle dielectric waveguide system having multiple dielectric waveguidesubcomponents. For example, two or more dielectric waveguides can bemanufactured as single system that can be installed around a wire in asingle installation such that the dielectric waveguides are eitherpre-positioned or adjustable relative to each other (either manually orautomatically) in accordance with the single system. Receivers coupledto dielectric waveguides 606 and 604 can use diversity combining tocombine signals received from both dielectric waveguides 606 and 604 inorder to maximize the signal quality. In other embodiments, if one orthe other of a dielectric waveguide 604 and 606 receives a transmissionthat is above a predetermined threshold, receivers can use selectiondiversity when deciding which signal to use.

It is noted that the graphical representations of waves 608 and 610 arepresented merely to illustrate the principles that guided wave 608induces or otherwise launches a wave 610 on a dielectric waveguide 604.The actual electric and magnetic fields generated as a result of suchwave propagation may vary depending on the frequencies employed, thedesign of the dielectric waveguide 604, the dimensions and compositionof the wire 602, as well as its surface characteristics, its optionalinsulation, the electromagnetic properties of the surroundingenvironment, etc.

Turning now to FIG. 7, illustrated is a block diagram of an example,non-limiting embodiment of a bidirectional dielectric waveguide couplingsystem 700 in accordance with various aspects described herein. Such asystem 700 implements a transmission device with a coupling module thatincludes two dielectric waveguides 704 and 714 can be placed near a wire702 such that guided waves (e.g., surface waves or other electromagneticwaves) propagating along the wire 702 are coupled to dielectricwaveguide 704 as wave 706, and then are boosted or repeated by repeaterdevice 710 and launched as a guided wave 716 onto dielectric waveguide714. The guided wave 716 can then couple to wire 702 and continue topropagate along the wire 702. In an example embodiment, the repeaterdevice 710 can receive at least a portion of the power utilized forboosting or repeating through magnetic coupling with the wire 702, whichcan be a power line.

In some embodiments, repeater device 710 can repeat the transmissionassociated with wave 706, and in other embodiments, repeater device 710can be associated with a distributed antenna system and/or base stationdevice located near the repeater device 710. Receiver waveguide 708 canreceive the wave 706 from the dielectric waveguide 704 and transmitterwaveguide 712 can launch guided wave 716 onto dielectric waveguide 714.Between receiver waveguide 708 and transmitter waveguide 712, the signalcan be amplified to correct for signal loss and other inefficienciesassociated with guided wave communications or the signal can be receivedand processed to extract the data contained therein and regenerated fortransmission. In an example embodiment, a signal can be extracted fromthe transmission and processed and otherwise emitted to mobile devicesnearby via distributed antennas communicably coupled to the repeaterdevice 710. Similarly, signals and/or communications received by thedistributed antennas can be inserted into the transmission that isgenerated and launched onto dielectric waveguide 714 by transmitterwaveguide 712. Accordingly, the repeater system 700 depicted in FIG. 7can be comparable in function to the dielectric waveguide couplingdevice 108 and 110 in FIG. 1.

It is noted that although FIG. 7 shows guided wave transmissions 706 and716 entering from the left and exiting to the right respectively, thisis merely a simplification and is not intended to be limiting. In otherembodiments, receiver waveguide 708 and transmitter waveguide 712 canalso function as transmitters and receivers respectively, allowing therepeater device 710 to be bi-directional.

In an example embodiment, repeater device 710 can be placed at locationswhere there are discontinuities or obstacles on the wire 702. Theseobstacles can include transformers, connections, utility poles, andother such power line devices. The repeater device 710 can help theguided (e.g., surface) waves jump over these obstacles on the line andboost the transmission power at the same time. In other embodiments, adielectric waveguide can be used to jump over the obstacle without theuse of a repeater device. In that embodiment, both ends of thedielectric waveguide can be tied or fastened to the wire, thus providinga path for the guided wave to travel without being blocked by theobstacle.

Turning now to FIG. 8, illustrated is a block diagram of an example,non-limiting embodiment of a bidirectional dielectric waveguide coupler800 in accordance with various aspects described herein. Thebidirectional dielectric waveguide coupler 800 implements a transmissiondevice with a coupling module that can employ diversity paths in thecase of when two or more wires are strung between utility poles. Sinceguided wave transmissions have different transmission efficiencies andcoupling efficiencies for insulated wires and un-insulated wires basedon weather, precipitation and atmospheric conditions, it can beadvantageous to selectively transmit on either an insulated wire orun-insulated wire at certain times.

In the embodiment shown in FIG. 8, the repeater device uses a receiverwaveguide 808 to receive a guided wave traveling along uninsulated wire802 and repeats the transmission using transmitter waveguide 810 as aguided wave along insulated wire 804. In other embodiments, repeaterdevice can switch from the insulated wire 804 to the un-insulated wire802, or can repeat the transmissions along the same paths. Repeaterdevice 806 can include sensors, or be in communication with sensors thatindicate conditions that can affect the transmission. Based on thefeedback received from the sensors, the repeater device 806 can make thedetermination about whether to keep the transmission along the samewire, or transfer the transmission to the other wire.

Turning now to FIG. 9, illustrated is a block diagram illustrating anexample, non-limiting embodiment of a bidirectional repeater system 900.Bidirectional repeater system 900 implements a transmission device witha coupling module that includes waveguide coupling devices 902 and 904that receive and transmit transmissions from other coupling deviceslocated in a distributed antenna system or backhaul system.

In various embodiments, waveguide coupling device 902 can receive atransmission from another waveguide coupling device, wherein thetransmission has a plurality of subcarriers. Diplexer 906 can separatethe transmission from other transmissions, for example by filtration,and direct the transmission to low-noise amplifier (“LNA”) 908. Afrequency mixer 928, with help from a local oscillator 912, candownshift the transmission (which is in the millimeter-wave band oraround 38 GHz in some embodiments) to a lower frequency, whether it is acellular band (−1.9 GHz) for a distributed antenna system, a nativefrequency, or other frequency for a backhaul system. An extractor 932can extract the signal on the subcarrier that corresponds to the antennaor other output component 922 and direct the signal to the outputcomponent 922. For the signals that are not being extracted at thisantenna location, extractor 932 can redirect them to another frequencymixer 936, where the signals are used to modulate a carrier wavegenerated by local oscillator 914. The carrier wave, with itssubcarriers, is directed to a power amplifier (“PA”) 916 and isretransmitted by waveguide coupling device 904 to another repeatersystem, via diplexer 920.

At the output device 922, a PA 924 can boost the signal for transmissionto the mobile device. An LNA 926 can be used to amplify weak signalsthat are received from the mobile device and then send the signal to amultiplexer 934 which merges the signal with signals that have beenreceived from waveguide coupling device 904. The output device 922 canbe coupled to an antenna in a distributed antenna system or otherantenna via, for example, a diplexer, duplexer or a transmit receiveswitch not specifically shown. The signals received from coupling device904 have been split by diplexer 920, and then passed through LNA 918,and downshifted in frequency by frequency mixer 938. When the signalsare combined by multiplexer 934, they are upshifted in frequency byfrequency mixer 930, and then boosted by PA 910, and transmitted back tothe launcher or on to another repeater by waveguide coupling device 902.In an example embodiment, the bidirectional repeater system 900 can bejust a repeater without the antenna/output device 922. It will beappreciated that in some embodiments, a bidirectional repeater system900 could also be implemented using two distinct and separateuni-directional repeaters. In an alternative embodiment, a bidirectionalrepeater system 900 could also be a booster or otherwise performretransmissions without downshifting and upshifting. Indeed in exampleembodiment, the retransmissions can be based upon receiving a signal orguided wave and performing some signal or guided wave processing orreshaping, filtering, and/or amplification, prior to retransmission ofthe signal or guided wave.

FIG. 10 illustrates a process in connection with the aforementionedsystems. The process in FIG. 10 can be implemented for example bysystems 100, 200, 300, 400, 500, 600, 700, 800, and 900 illustrated inFIGS. 1-9 respectively. While for purposes of simplicity of explanation,the methods are shown and described as a series of blocks, it is to beunderstood and appreciated that the claimed subject matter is notlimited by the order of the blocks, as some blocks may occur indifferent orders and/or concurrently with other blocks from what isdepicted and described herein. Moreover, not all illustrated blocks maybe required to implement the methods described hereinafter.

FIG. 10 illustrates a flow diagram of an example, non-limitingembodiment of a method for transmitting a transmission with a dielectricwaveguide coupler as described herein. Method 1000 can begin at 1002where a first electromagnetic wave is emitted by a transmission devicethat propagates at least in part on a waveguide surface of a waveguide,wherein the waveguide surface of the waveguide does not surround inwhole or in substantial part a wire surface of a wire. The transmissionthat is generated by a transmitter can be based on a signal receivedfrom a base station device, access point, network or a mobile device.

At 1004, based upon configuring the waveguide in proximity of the wire,the guided wave then couples at least a part of the firstelectromagnetic wave to a wire surface, forming a second electromagneticwave (e.g., a surface wave) that propagates at least partially aroundthe wire surface, wherein the wire is in proximity to the waveguide.This can be done in response to positioning a portion of the dielectricwaveguide (e.g., a tangent of a curve of the dielectric waveguide) nearand parallel to the wire, wherein a wavelength of the electromagneticwave is smaller than a circumference of the wire and the dielectricwaveguide. The guided wave, or surface wave, stays parallel to the wireeven as the wire bends and flexes. Bends can increase transmissionlosses, which are also dependent on wire diameters, frequency, andmaterials. The coupling interface between the wire and the waveguide canalso be configured to achieve the desired level of coupling, asdescribed herein, which can include tapering an end of the waveguide toimprove impedance matching between the waveguide and the wire.

The transmission that is emitted by the transmitter can exhibit one ormore waveguide modes. The waveguide modes can be dependent on the shapeand/or design of the waveguide. The propagation modes on the wire can bedifferent than the waveguide modes due to the different characteristicsof the waveguide and the wire. When the circumference of the wire iscomparable in size to, or greater, than a wavelength of thetransmission, the guided wave exhibits multiple wave propagation modes.The guided wave can therefore comprise more than one type of electricand magnetic field configuration. As the guided wave (e.g., surfacewave) propagates down the wire, the electrical and magnetic fieldconfigurations may remain substantially the same from end to end of thewire or vary as the transmission traverses the wave by rotation,dispersion, attenuation or other effects.

Referring now to FIG. 11, there is illustrated a block diagram of acomputing environment in accordance with various aspects describedherein. In order to provide additional context for various embodimentsof the embodiments described herein, FIG. 11 and the followingdiscussion are intended to provide a brief, general description of asuitable computing environment 1100 in which the various embodiments ofthe embodiment described herein can be implemented. While theembodiments have been described above in the general context ofcomputer-executable instructions that can be run on one or morecomputers, those skilled in the art will recognize that the embodimentscan be also implemented in combination with other program modules and/oras a combination of hardware and software.

Generally, program modules comprise routines, programs, components, datastructures, etc., that perform particular tasks or implement particularabstract data types. Moreover, those skilled in the art will appreciatethat the inventive methods can be practiced with other computer systemconfigurations, comprising single-processor or multiprocessor computersystems, minicomputers, mainframe computers, as well as personalcomputers, hand-held computing devices, microprocessor-based orprogrammable consumer electronics, and the like, each of which can beoperatively coupled to one or more associated devices.

The terms “first,” “second,” “third,” and so forth, as used in theclaims, unless otherwise clear by context, is for clarity only anddoesn't otherwise indicate or imply any order in time. For instance, “afirst determination,” “a second determination,” and “a thirddetermination,” does not indicate or imply that the first determinationis to be made before the second determination, or vice versa, etc.

The illustrated embodiments of the embodiments herein can be alsopracticed in distributed computing environments where certain tasks areperformed by remote processing devices that are linked through acommunications network. In a distributed computing environment, programmodules can be located in both local and remote memory storage devices.

Computing devices typically comprise a variety of media, which cancomprise computer-readable storage media and/or communications media,which two terms are used herein differently from one another as follows.Computer-readable storage media can be any available storage media thatcan be accessed by the computer and comprises both volatile andnonvolatile media, removable and non-removable media. By way of example,and not limitation, computer-readable storage media can be implementedin connection with any method or technology for storage of informationsuch as computer-readable instructions, program modules, structured dataor unstructured data.

Computer-readable storage media can comprise, but are not limited to,random access memory (RAM), read only memory (ROM), electricallyerasable programmable read only memory (EEPROM), flash memory or othermemory technology, compact disk read only memory (CD-ROM), digitalversatile disk (DVD) or other optical disk storage, magnetic cassettes,magnetic tape, magnetic disk storage or other magnetic storage devicesor other tangible and/or non-transitory media which can be used to storedesired information. In this regard, the terms “tangible” or“non-transitory” herein as applied to storage, memory orcomputer-readable media, are to be understood to exclude onlypropagating transitory signals per se as modifiers and do not relinquishrights to all standard storage, memory or computer-readable media thatare not only propagating transitory signals per se.

Computer-readable storage media can be accessed by one or more local orremote computing devices, e.g., via access requests, queries or otherdata retrieval protocols, for a variety of operations with respect tothe information stored by the medium.

Communications media typically embody computer-readable instructions,data structures, program modules or other structured or unstructureddata in a data signal such as a modulated data signal, e.g., a carrierwave or other transport mechanism, and comprises any informationdelivery or transport media. The term “modulated data signal” or signalsrefers to a signal that has one or more of its characteristics set orchanged in such a manner as to encode information in one or moresignals. By way of example, and not limitation, communication mediacomprise wired media, such as a wired network or direct-wiredconnection, and wireless media such as acoustic, RF, infrared and otherwireless media.

With reference again to FIG. 11, the example environment 1100 fortransmitting and receiving signals via base station (e.g., base stationdevices 104 and 508) and repeater devices (e.g., repeater devices 710,806, and 900) comprises a computer 1102, the computer 1102 comprising aprocessing unit 1104, a system memory 1106 and a system bus 1108. Thesystem bus 1108 couples system components including, but not limited to,the system memory 1106 to the processing unit 1104. The processing unit1104 can be any of various commercially available processors. Dualmicroprocessors and other multi-processor architectures can also beemployed as the processing unit 1104.

The system bus 1108 can be any of several types of bus structure thatcan further interconnect to a memory bus (with or without a memorycontroller), a peripheral bus, and a local bus using any of a variety ofcommercially available bus architectures. The system memory 1106comprises ROM 1110 and RAM 1112. A basic input/output system (BIOS) canbe stored in a non-volatile memory such as ROM, erasable programmableread only memory (EPROM), EEPROM, which BIOS contains the basic routinesthat help to transfer information between elements within the computer1102, such as during startup. The RAM 1112 can also comprise ahigh-speed RAM such as static RAM for caching data.

The computer 1102 further comprises an internal hard disk drive (HDD)1114 (e.g., EIDE, SATA), which internal hard disk drive 1114 can also beconfigured for external use in a suitable chassis (not shown), amagnetic floppy disk drive (FDD) 1116, (e.g., to read from or write to aremovable diskette 1118) and an optical disk drive 1120, (e.g., readinga CD-ROM disk 1122 or, to read from or write to other high capacityoptical media such as the DVD). The hard disk drive 1114, magnetic diskdrive 1116 and optical disk drive 1120 can be connected to the systembus 1108 by a hard disk drive interface 1124, a magnetic disk driveinterface 1126 and an optical drive interface 1128, respectively. Theinterface 1124 for external drive implementations comprises at least oneor both of Universal Serial Bus (USB) and Institute of Electrical andElectronics Engineers (IEEE) 1394 interface technologies. Other externaldrive connection technologies are within contemplation of theembodiments described herein.

The drives and their associated computer-readable storage media providenonvolatile storage of data, data structures, computer-executableinstructions, and so forth. For the computer 1102, the drives andstorage media accommodate the storage of any data in a suitable digitalformat. Although the description of computer-readable storage mediaabove refers to a hard disk drive (HDD), a removable magnetic diskette,and a removable optical media such as a CD or DVD, it should beappreciated by those skilled in the art that other types of storagemedia which are readable by a computer, such as zip drives, magneticcassettes, flash memory cards, cartridges, and the like, can also beused in the example operating environment, and further, that any suchstorage media can contain computer-executable instructions forperforming the methods described herein.

A number of program modules can be stored in the drives and RAM 1112,comprising an operating system 1130, one or more application programs1132, other program modules 1134 and program data 1136. All or portionsof the operating system, applications, modules, and/or data can also becached in the RAM 1112. The systems and methods described herein can beimplemented utilizing various commercially available operating systemsor combinations of operating systems. Examples of application programs1132 that can be implemented and otherwise executed by processing unit1104 include the diversity selection determining performed by repeaterdevice 806. Base station device 508 shown in FIG. 5, also has stored onmemory many applications and programs that can be executed by processingunit 1104 in this exemplary computing environment 1100.

A user can enter commands and information into the computer 1102 throughone or more wired/wireless input devices, e.g., a keyboard 1138 and apointing device, such as a mouse 1140. Other input devices (not shown)can comprise a microphone, an infrared (IR) remote control, a joystick,a game pad, a stylus pen, touch screen or the like. These and otherinput devices are often connected to the processing unit 1104 through aninput device interface 1142 that can be coupled to the system bus 1108,but can be connected by other interfaces, such as a parallel port, anIEEE 1394 serial port, a game port, a universal serial bus (USB) port,an IR interface, etc.

A monitor 1144 or other type of display device can be also connected tothe system bus 1108 via an interface, such as a video adapter 1146. Itwill also be appreciated that in alternative embodiments, a monitor 1144can also be any display device (e.g., another computer having a display,a smart phone, a tablet computer, etc.) for receiving displayinformation associated with computer 1102 via any communication means,including via the Internet and cloud-based networks. In addition to themonitor 1144, a computer typically comprises other peripheral outputdevices (not shown), such as speakers, printers, etc.

The computer 1102 can operate in a networked environment using logicalconnections via wired and/or wireless communications to one or moreremote computers, such as a remote computer(s) 1148. The remotecomputer(s) 1148 can be a workstation, a server computer, a router, apersonal computer, portable computer, microprocessor-based entertainmentappliance, a peer device or other common network node, and typicallycomprises many or all of the elements described relative to the computer1102, although, for purposes of brevity, only a memory/storage device1150 is illustrated. The logical connections depicted comprisewired/wireless connectivity to a local area network (LAN) 1152 and/orlarger networks, e.g., a wide area network (WAN) 1154. Such LAN and WANnetworking environments are commonplace in offices and companies, andfacilitate enterprise-wide computer networks, such as intranets, all ofwhich can connect to a global communications network, e.g., theInternet.

When used in a LAN networking environment, the computer 1102 can beconnected to the local network 1152 through a wired and/or wirelesscommunication network interface or adapter 1156. The adapter 1156 canfacilitate wired or wireless communication to the LAN 1152, which canalso comprise a wireless AP disposed thereon for communicating with thewireless adapter 1156.

When used in a WAN networking environment, the computer 1102 cancomprise a modem 1158 or can be connected to a communications server onthe WAN 1154 or has other means for establishing communications over theWAN 1154, such as by way of the Internet. The modem 1158, which can beinternal or external and a wired or wireless device, can be connected tothe system bus 1108 via the input device interface 1142. In a networkedenvironment, program modules depicted relative to the computer 1102 orportions thereof, can be stored in the remote memory/storage device1150. It will be appreciated that the network connections shown areexample and other means of establishing a communications link betweenthe computers can be used.

The computer 1102 can be operable to communicate with any wirelessdevices or entities operatively disposed in wireless communication,e.g., a printer, scanner, desktop and/or portable computer, portabledata assistant, communications satellite, any piece of equipment orlocation associated with a wirelessly detectable tag (e.g., a kiosk,news stand, restroom), and telephone. This can comprise WirelessFidelity (Wi-Fi) and BLUETOOTH® wireless technologies. Thus, thecommunication can be a predefined structure as with a conventionalnetwork or simply an ad hoc communication between at least two devices.

Wi-Fi can allow connection to the Internet from a couch at home, a bedin a hotel room or a conference room at work, without wires. Wi-Fi is awireless technology similar to that used in a cell phone that enablessuch devices, e.g., computers, to send and receive data indoors and out;anywhere within the range of a base station. Wi-Fi networks use radiotechnologies called IEEE 802.11 (a, b, g, n, ac, etc.) to providesecure, reliable, fast wireless connectivity. A Wi-Fi network can beused to connect computers to each other, to the Internet, and to wirednetworks (which can use IEEE 802.3 or Ethernet). Wi-Fi networks operatein the unlicensed 2.4 and 5 GHz radio bands for example or with productsthat contain both bands (dual band), so the networks can providereal-world performance similar to the basic 10BaseT wired Ethernetnetworks used in many offices.

FIG. 12 presents an example embodiment 1200 of a mobile network platform1210 that can implement and exploit one or more aspects of the disclosedsubject matter described herein. In one or more embodiments, the mobilenetwork platform 1210 can generate and receive signals transmitted andreceived by base stations (e.g., base station devices 104 and 508) andrepeater devices (e.g., repeater devices 710, 806, and 900) associatedwith the disclosed subject matter. Generally, wireless network platform1210 can comprise components, e.g., nodes, gateways, interfaces,servers, or disparate platforms, that facilitate both packet-switched(PS) (e.g., internet protocol (IP), frame relay, asynchronous transfermode (ATM)) and circuit-switched (CS) traffic (e.g., voice and data), aswell as control generation for networked wireless telecommunication. Asa non-limiting example, wireless network platform 1210 can be includedin telecommunications carrier networks, and can be consideredcarrier-side components as discussed elsewhere herein. Mobile networkplatform 1210 comprises CS gateway node(s) 1212 which can interface CStraffic received from legacy networks like telephony network(s) 1240(e.g., public switched telephone network (PSTN), or public land mobilenetwork (PLMN)) or a signaling system #7 (SS7) network 1260. Circuitswitched gateway node(s) 1212 can authorize and authenticate traffic(e.g., voice) arising from such networks. Additionally, CS gatewaynode(s) 1212 can access mobility, or roaming, data generated through SS7network 1260; for instance, mobility data stored in a visited locationregister (VLR), which can reside in memory 1230. Moreover, CS gatewaynode(s) 1212 interfaces CS-based traffic and signaling and PS gatewaynode(s) 1218. As an example, in a 3GPP UMTS network, CS gateway node(s)1212 can be realized at least in part in gateway GPRS support node(s)(GGSN). It should be appreciated that functionality and specificoperation of CS gateway node(s) 1212, PS gateway node(s) 1218, andserving node(s) 1216, is provided and dictated by radio technology(ies)utilized by mobile network platform 1210 for telecommunication.

In addition to receiving and processing CS-switched traffic andsignaling, PS gateway node(s) 1218 can authorize and authenticatePS-based data sessions with served mobile devices. Data sessions cancomprise traffic, or content(s), exchanged with networks external to thewireless network platform 1210, like wide area network(s) (WANs) 1250,enterprise network(s) 1270, and service network(s) 1280, which can beembodied in local area network(s) (LANs), can also be interfaced withmobile network platform 1210 through PS gateway node(s) 1218. It is tobe noted that WANs 1250 and enterprise network(s) 1270 can embody, atleast in part, a service network(s) like IP multimedia subsystem (IMS).Based on radio technology layer(s) available in technology resource(s),packet-switched gateway node(s) 1218 can generate packet data protocolcontexts when a data session is established; other data structures thatfacilitate routing of packetized data also can be generated. To thatend, in an aspect, PS gateway node(s) 1218 can comprise a tunnelinterface (e.g., tunnel termination gateway (TTG) in 3GPP UMTSnetwork(s) (not shown)) which can facilitate packetized communicationwith disparate wireless network(s), such as Wi-Fi networks.

In embodiment 1200, wireless network platform 1210 also comprisesserving node(s) 1216 that, based upon available radio technologylayer(s) within technology resource(s), convey the various packetizedflows of data streams received through PS gateway node(s) 1218. It is tobe noted that for technology resource(s) that rely primarily on CScommunication, server node(s) can deliver traffic without reliance on PSgateway node(s) 1218; for example, server node(s) can embody at least inpart a mobile switching center. As an example, in a 3GPP UMTS network,serving node(s) 1216 can be embodied in serving GPRS support node(s)(SGSN).

For radio technologies that exploit packetized communication, server(s)1214 in wireless network platform 1210 can execute numerous applicationsthat can generate multiple disparate packetized data streams or flows,and manage (e.g., schedule, queue, format . . . ) such flows. Suchapplication(s) can comprise add-on features to standard services (forexample, provisioning, billing, customer support . . . ) provided bywireless network platform 1210. Data streams (e.g., content(s) that arepart of a voice call or data session) can be conveyed to PS gatewaynode(s) 1218 for authorization/authentication and initiation of a datasession, and to serving node(s) 1216 for communication thereafter. Inaddition to application server, server(s) 1214 can comprise utilityserver(s), a utility server can comprise a provisioning server, anoperations and maintenance server, a security server that can implementat least in part a certificate authority and firewalls as well as othersecurity mechanisms, and the like. In an aspect, security server(s)secure communication served through wireless network platform 1210 toensure network's operation and data integrity in addition toauthorization and authentication procedures that CS gateway node(s) 1212and PS gateway node(s) 1218 can enact. Moreover, provisioning server(s)can provision services from external network(s) like networks operatedby a disparate service provider; for instance, WAN 1250 or GlobalPositioning System (GPS) network(s) (not shown). Provisioning server(s)can also provision coverage through networks associated to wirelessnetwork platform 1210 (e.g., deployed and operated by the same serviceprovider), such as the distributed antennas networks shown in FIG. 1(s)that enhance wireless service coverage by providing more networkcoverage. Repeater devices such as those shown in FIGS. 7, 8, and 9 alsoimprove network coverage in order to enhance subscriber serviceexperience by way of UE 1275.

It is to be noted that server(s) 1214 can comprise one or moreprocessors configured to confer at least in part the functionality ofmacro network platform 1210. To that end, the one or more processor canexecute code instructions stored in memory 1230, for example. It isshould be appreciated that server(s) 1214 can comprise a contentmanager, which operates in substantially the same manner as describedhereinbefore.

In example embodiment 1200, memory 1230 can store information related tooperation of wireless network platform 1210. Other operationalinformation can comprise provisioning information of mobile devicesserved through wireless platform network 1210, subscriber databases;application intelligence, pricing schemes, e.g., promotional rates,flat-rate programs, couponing campaigns; technical specification(s)consistent with telecommunication protocols for operation of disparateradio, or wireless, technology layers; and so forth. Memory 1230 canalso store information from at least one of telephony network(s) 1240,WAN 1250, enterprise network(s) 1270, or SS7 network 1260. In an aspect,memory 1230 can be, for example, accessed as part of a data storecomponent or as a remotely connected memory store.

In order to provide a context for the various aspects of the disclosedsubject matter, FIG. 12, and the following discussion, are intended toprovide a brief, general description of a suitable environment in whichthe various aspects of the disclosed subject matter can be implemented.While the subject matter has been described above in the general contextof computer-executable instructions of a computer program that runs on acomputer and/or computers, those skilled in the art will recognize thatthe disclosed subject matter also can be implemented in combination withother program modules. Generally, program modules comprise routines,programs, components, data structures, etc. that perform particulartasks and/or implement particular abstract data types.

Turning now to FIGS. 13 a, 13 b, and 13 c, illustrated are blockdiagrams of example, non-limiting embodiments of a slotted waveguidecoupler system 1300 in accordance with various aspects described herein.In particular, cross sections of various waveguides are presented nearthe junction where the waveguide launches a guided wave along a wire. InFIG. 13 a, the waveguide coupler system comprises a wire 1306 that ispositioned with respect to a waveguide 1302, such that the wire 1306fits within or near a slot formed in the waveguide 1302 that runslongitudinally with respect to the wire 1306. The opposing ends 1304 aand 1304 b of the waveguide 1302, and the waveguide 1302 itself,surrounds less than 180 degrees of the wire surface of the wire 1306.

In FIG. 13b the waveguide coupler system comprises a wire 1314 that ispositioned with respect to a waveguide 1308, such that the wire 1314fits within or near a slot formed in the waveguide 1308 that runslongitudinally with respect to the wire 1314. The slot surfaces of thewaveguide 1308 can be non-parallel, and two different exemplaryembodiments are shown in FIG. 13 b. In the first, slot surfaces 1310 aand 1310 b can be non-parallel and aim outwards, slightly wider than thewidth of the wire 1314. In the other embodiment, the slots surfaces 1312a and 1312 b can still be non-parallel, but narrow to form a slotopening smaller than a width of the wire 1314. Any range of angles ofthe non-parallel slot surfaces are possible, of which these are twoexemplary embodiments.

In FIG. 13 c, the waveguide coupler system shows a wire 1320 that fitswithin a slot formed in waveguide 1316. The slot surfaces 1318 a and1318 b in this exemplary embodiment can be parallel, but the axis 1326of the wire 1320 is not aligned with the axis 1324 of the waveguide1316. The waveguide 1316 and the wire 1320 are therefore not coaxiallyaligned. In another embodiment, shown, a possible position of the wireat 1322 also has an axis 1328 that is not aligned with the axis 1324 ofthe waveguide 1316.

It is to be appreciated that while three different embodiments showinga) waveguide surfaces that surround less than 180 degrees of the wire,b) non parallel slot surfaces, and c) coaxially unaligned wires andwaveguide were shown separately in FIGS. 13 a, 13 b, and 13 c, invarious embodiments, diverse combinations of the listed features arepossible.

Turning now to FIG. 14, illustrated is an example, non-limitingembodiment of a waveguide coupling system 1400 in accordance withvarious aspects described herein. FIG. 14 depicts a cross sectionalrepresentation of the waveguide and wire embodiments shown in FIGS. 2,3, 4, etc. As can be seen in 1400, the wire 1404 can be positioneddirectly next to and touching waveguide 1402. In other embodiments, asshown in waveguide coupling system 1410 in FIG. 14 b, the wire 1414 canstill be placed near, but not actually touching waveguide strip 1412. Inboth cases, electromagnetic waves traveling along the waveguides caninduce other electromagnetic waves on to the wires and vice versa. Also,in both embodiments, the wires 1404 and 1414 are placed outside thecross-sectional area defined by the outer surfaces of waveguides 1402and 1412.

For the purposes of this disclosure, a waveguide does not surround, insubstantial part, a wire surface of a wire when the waveguide does notsurround an axial region of the surface, when viewed in cross-section,of more than 180 degrees. For avoidance of doubt, a waveguide does notsurround, in substantial part a surface of a wire when the waveguidesurrounds an axial region of the surface, when viewed in cross-section,of 180 degrees or less.

It is to be appreciated that while FIGS. 14 and 14 b show wires 1404 and1414 having a circular shape and waveguides 1402 and 1412 havingrectangular shapes, this is not meant to be limiting. In otherembodiments, wires and waveguides can have a variety of shapes, sizes,and configurations. The shapes can include, but not be limited to: ovalsor other ellipsoid shapes, octagons, quadrilaterals or other polygonswith either sharp or rounded edges, or other shapes. Additionally, insome embodiments, the wires 1404 and 1414 can be stranded wirescomprising smaller gauge wires, such as a helical strand, braid or othercoupling of individual strands into a single wire. Any of wires andwaveguides shown in the figures and described throughout this disclosurecan include one or more of these embodiments.

In the subject specification, terms such as “store,” “storage,” “datastore,” data storage,” “database,” and substantially any otherinformation storage component relevant to operation and functionality ofa component, refer to “memory components,” or entities embodied in a“memory” or components comprising the memory. It will be appreciatedthat the memory components described herein can be either volatilememory or nonvolatile memory, or can comprise both volatile andnonvolatile memory, by way of illustration, and not limitation, volatilememory, non-volatile memory, disk storage, and memory storage. Further,nonvolatile memory can be included in read only memory (ROM),programmable ROM (PROM), electrically programmable ROM (EPROM),electrically erasable ROM (EEPROM), or flash memory. Volatile memory cancomprise random access memory (RAM), which acts as external cachememory. By way of illustration and not limitation, RAM is available inmany forms such as synchronous RAM (SRAM), dynamic RAM (DRAM),synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhancedSDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and direct Rambus RAM (DRRAM).Additionally, the disclosed memory components of systems or methodsherein are intended to comprise, without being limited to comprising,these and any other suitable types of memory.

Moreover, it will be noted that the disclosed subject matter can bepracticed with other computer system configurations, comprisingsingle-processor or multiprocessor computer systems, mini-computingdevices, mainframe computers, as well as personal computers, hand-heldcomputing devices (e.g., PDA, phone, watch, tablet computers, netbookcomputers, etc.), microprocessor-based or programmable consumer orindustrial electronics, and the like. The illustrated aspects can alsobe practiced in distributed computing environments where tasks areperformed by remote processing devices that are linked through acommunications network; however, some if not all aspects of the subjectdisclosure can be practiced on stand-alone computers. In a distributedcomputing environment, program modules can be located in both local andremote memory storage devices.

Some of the embodiments described herein can also employ artificialintelligence (AI) to facilitate automating one or more featuresdescribed herein. For example, artificial intelligence can be used todetermine positions around a wire that dielectric waveguides 604 and 606should be placed in order to maximize transfer efficiency. Theembodiments (e.g., in connection with automatically identifying acquiredcell sites that provide a maximum value/benefit after addition to anexisting communication network) can employ various AI-based schemes forcarrying out various embodiments thereof. Moreover, the classifier canbe employed to determine a ranking or priority of the each cell site ofthe acquired network. A classifier is a function that maps an inputattribute vector, x=(x1, x2, x3, x4, . . . , xn), to a confidence thatthe input belongs to a class, that is, f(x)=confidence(class). Suchclassification can employ a probabilistic and/or statistical-basedanalysis (e.g., factoring into the analysis utilities and costs) toprognose or infer an action that a user desires to be automaticallyperformed. A support vector machine (SVM) is an example of a classifierthat can be employed. The SVM operates by finding a hypersurface in thespace of possible inputs, which the hypersurface attempts to split thetriggering criteria from the non-triggering events. Intuitively, thismakes the classification correct for testing data that is near, but notidentical to training data. Other directed and undirected modelclassification approaches comprise, e.g., naïve Bayes, Bayesiannetworks, decision trees, neural networks, fuzzy logic models, andprobabilistic classification models providing different patterns ofindependence that can be employed. Classification as used herein also isinclusive of statistical regression that is utilized to develop modelsof priority.

As will be readily appreciated, one or more of the embodiments canemploy classifiers that are explicitly trained (e.g., via a generictraining data) as well as implicitly trained (e.g., via observing UEbehavior, operator preferences, historical information, receivingextrinsic information). For example, SVMs can be configured via alearning or training phase within a classifier constructor and featureselection module. Thus, the classifier(s) can be used to automaticallylearn and perform a number of functions, including but not limited todetermining according to a predetermined criteria which of the acquiredcell sites will benefit a maximum number of subscribers and/or which ofthe acquired cell sites will add minimum value to the existingcommunication network coverage, etc.

As used in some contexts in this application, in some embodiments, theterms “component”, “system” and the like are intended to refer to, orcomprise, a computer-related entity or an entity related to anoperational apparatus with one or more specific functionalities, whereinthe entity can be either hardware, a combination of hardware andsoftware, software, or software in execution. As an example, a componentmay be, but is not limited to being, a process running on a processor, aprocessor, an object, an executable, a thread of execution,computer-executable instructions, a program, and/or a computer. By wayof illustration and not limitation, both an application running on aserver and the server can be a component. One or more components mayreside within a process and/or thread of execution and a component maybe localized on one computer and/or distributed between two or morecomputers. In addition, these components can execute from variouscomputer readable media having various data structures stored thereon.The components may communicate via local and/or remote processes such asin accordance with a signal having one or more data packets (e.g., datafrom one component interacting with another component in a local system,distributed system, and/or across a network such as the Internet withother systems via the signal). As another example, a component can be anapparatus with specific functionality provided by mechanical partsoperated by electric or electronic circuitry, which is operated by asoftware or firmware application executed by a processor, wherein theprocessor can be internal or external to the apparatus and executes atleast a part of the software or firmware application. As yet anotherexample, a component can be an apparatus that provides specificfunctionality through electronic components without mechanical parts,the electronic components can comprise a processor therein to executesoftware or firmware that confers at least in part the functionality ofthe electronic components. While various components have beenillustrated as separate components, it will be appreciated that multiplecomponents can be implemented as a single component, or a singlecomponent can be implemented as multiple components, without departingfrom example embodiments.

Further, the various embodiments can be implemented as a method,apparatus or article of manufacture using standard programming and/orengineering techniques to produce software, firmware, hardware or anycombination thereof to control a computer to implement the disclosedsubject matter. The term “article of manufacture” as used herein isintended to encompass a computer program accessible from anycomputer-readable device or computer-readable storage/communicationsmedia. For example, computer readable storage media can include, but arenot limited to, magnetic storage devices (e.g., hard disk, floppy disk,magnetic strips), optical disks (e.g., compact disk (CD), digitalversatile disk (DVD)), smart cards, and flash memory devices (e.g.,card, stick, key drive). Of course, those skilled in the art willrecognize many modifications can be made to this configuration withoutdeparting from the scope or spirit of the various embodiments.

In addition, the words “example” and “exemplary” are used herein to meanserving as an instance or illustration. Any embodiment or designdescribed herein as “example” or “exemplary” is not necessarily to beconstrued as preferred or advantageous over other embodiments ordesigns. Rather, use of the word example or exemplary is intended topresent concepts in a concrete fashion. As used in this application, theterm “or” is intended to mean an inclusive “or” rather than an exclusive“or”. That is, unless specified otherwise or clear from context, “Xemploys A or B” is intended to mean any of the natural inclusivepermutations. That is, if X employs A; X employs B; or X employs both Aand B, then “X employs A or B” is satisfied under any of the foregoinginstances. In addition, the articles “a” and “an” as used in thisapplication and the appended claims should generally be construed tomean “one or more” unless specified otherwise or clear from context tobe directed to a singular form.

Moreover, terms such as “user equipment,” “mobile station,” “mobile,”subscriber station,” “access terminal,” “terminal,” “handset,” “mobiledevice” (and/or terms representing similar terminology) can refer to awireless device utilized by a subscriber or user of a wirelesscommunication service to receive or convey data, control, voice, video,sound, gaming or substantially any data-stream or signaling-stream. Theforegoing terms are utilized interchangeably herein and with referenceto the related drawings.

Furthermore, the terms “user,” “subscriber,” “customer,” “consumer” andthe like are employed interchangeably throughout, unless contextwarrants particular distinctions among the terms. It should beappreciated that such terms can refer to human entities or automatedcomponents supported through artificial intelligence (e.g., a capacityto make inference based, at least, on complex mathematical formalisms),which can provide simulated vision, sound recognition and so forth.

As employed herein, the term “processor” can refer to substantially anycomputing processing unit or device comprising, but not limited tocomprising, single-core processors; single-processors with softwaremultithread execution capability; multi-core processors; multi-coreprocessors with software multithread execution capability; multi-coreprocessors with hardware multithread technology; parallel platforms; andparallel platforms with distributed shared memory. Additionally, aprocessor can refer to an integrated circuit, an application specificintegrated circuit (ASIC), a digital signal processor (DSP), a fieldprogrammable gate array (FPGA), a programmable logic controller (PLC), acomplex programmable logic device (CPLD), a discrete gate or transistorlogic, discrete hardware components or any combination thereof designedto perform the functions described herein. Processors can exploitnano-scale architectures such as, but not limited to, molecular andquantum-dot based transistors, switches and gates, in order to optimizespace usage or enhance performance of user equipment. A processor canalso be implemented as a combination of computing processing units.

Turning now to FIG. 15, a block diagram is shown illustrating anexample, non-limiting embodiment of a guided wave communication system1550. In operation, a transmission device 1500 receives one or morecommunication signals 1510 from a communication network or othercommunications device that include data and generates guided waves 1520to convey the data via the transmission medium 1525 to the transmissiondevice 1502. The transmission device 1502 receives the guided waves 1520and converts them to communication signals 1512 that include the datafor transmission to a communications network or other communicationsdevice. The communication network or networks can include a wirelesscommunication network such as a cellular voice and data network, awireless local area network, a satellite communications network, apersonal area network or other wireless network. The communicationnetwork or networks can include a wired communication network such as atelephone network, an Ethernet network, a local area network, a widearea network such as the Internet, a broadband access network, a cablenetwork, a fiber optic network, or other wired network. Thecommunication devices can include a network edge device, bridge deviceor home gateway, a set-top box, broadband modem, telephone adapter,access point, base station, or other fixed communication device, amobile communication device such as an automotive gateway, laptopcomputer, tablet, smartphone, cellular telephone, or other communicationdevice.

In an example embodiment, the guided wave communication system 1550 canoperate in a bi-directional fashion where transmission device 1500receives one or more communication signals 1512 from a communicationnetwork or device that includes other data and generates guided waves1522 to convey the other data via the transmission medium 1525 to thetransmission device 1500. In this mode of operation, the transmissiondevice 1502 receives the guided waves 1522 and converts them tocommunication signals 1510 that include the other data for transmissionto a communications network or device.

The transmission medium 1525 can include a wire or other conductor orinner portion having at least one inner portion surrounded by adielectric material, the dielectric material having an outer surface anda corresponding circumference. In an example embodiment, thetransmission medium 1525 operates as a single-wire transmission line toguide the transmission of an electromagnetic wave. When the transmissionmedium 1525 is implemented as a single wire transmission system, it caninclude a wire. The wire can be insulated or uninsulated, andsingle-stranded or multi-stranded. In other embodiments, thetransmission medium 1525 can contain conductors of other shapes orconfigurations including wire bundles, cables, rods, rails, pipes. Inaddition, the transmission medium 1525 can include non-conductors suchas dielectric pipes, rods, rails, or other dielectric members;combinations of conductors and dielectric materials or other guided wavetransmission medium. It should be noted that the transmission medium1525 can otherwise include any of the transmission media previouslydiscussed in conjunction with FIGS. 1-14.

According to an example embodiment, the guided waves 1520 and 1522 canbe contrasted with radio transmissions over free space/air orconventional propagation of electrical power or signals through theconductor of a wire. In particular, guided waves 1520 and 1522 aresurface waves and other electromagnetic waves that surround all or partof the surface of the transmission medium and propagate with low lossalong the transmission medium from transmission device 1500 totransmission device 1502, and vice versa. The guided waves 1520 and 1522can have a field structure (e.g., an electromagnetic field structure)that lies primarily or substantially outside of the transmission medium1525. In addition to the propagation of guided waves 1520 and 1522, thetransmission medium 1525 may optionally contain one or more wires thatpropagate electrical power or other communication signals in aconventional manner as a part of one or more electrical circuits.

Turning now to FIG. 16, a block diagram is shown illustrating anexample, non-limiting embodiment of a transmission device 1500 or 1502.The transmission device 1500 or 1502 includes a communications interface(I/F) 1600, a transceiver 1610 and a coupler 1620.

In an example of operation, the communications interface receives acommunication signal 1510 or 1512 that includes first data. In variousembodiments, the communications interface 1600 can include a wirelessinterface for receiving a wireless communication signal in accordancewith a wireless standard protocol such as LTE or other cellular voiceand data protocol, an 802.11 protocol, WIMAX protocol, UltraWidebandprotocol, Bluetooth protocol, Zigbee protocol, a direct broadcastsatellite (DBS) or other satellite communication protocol or otherwireless protocol. In addition or in the alternative, the communicationsinterface 1600 includes a wired interface that operates in accordancewith an Ethernet protocol, universal serial bus (USB) protocol, a dataover cable service interface specification (DOCSIS) protocol, a digitalsubscriber line (DSL) protocol, a Firewire (IEEE 1394) protocol, orother wired protocol. In additional to standards-based protocols, thecommunications interface 1600 can operate in conjunction with otherwired or wireless protocol. In addition, the communications interface1600 can optionally operate in conjunction with a protocol stack thatincludes multiple protocol layers.

In an example of operation, the transceiver 1610 generates a firstelectromagnetic wave based on the communication signal 1510 or 1512 toconvey the first data. The first electromagnetic wave has at least onecarrier frequency and at least one corresponding wavelength. In variousembodiments, the transceiver 1610 is a microwave transceiver thatoperates at a carrier frequency with a corresponding wavelength that isless than the circumference of the transmission medium 1525. The carrierfrequency can be within a millimeter wave frequency band of 30 GHz-300GHz. In one mode of operation, the transceiver 1610 merely upconvertsthe communications signal or signals 1510 or 1512 for transmission ofthe first electromagnetic signal in the millimeter wave band. In anothermode of operation, the communications interface 1600 either converts thecommunication signal 1510 or 1512 to a baseband or near baseband signalor extracts the first data from the communication signal 1510 or 1512and the transceiver 1610 modulates the first data, the baseband or nearbaseband signal for transmission.

In an example of operation, the coupler 1620 couples the firstelectromagnetic wave to the transmission medium 1525. The coupler 1620can be implemented via a dielectric waveguide coupler or any of thecouplers and coupling devices described in conjunction with FIGS. 1-14.In an example embodiment, the transmission medium 1525 includes a wireor other inner element surrounded by a dielectric material having anouter surface. The dielectric material can include an insulating jacket,a dielectric coating or other dielectric on the outer surface of thetransmission medium 1525. The inner portion can include a dielectric orother insulator, a conductor, air or other gas or void, or one or moreconductors.

In an example of operation, the coupling of the first electromagneticwave to the transmission medium 1525 forms a second electromagnetic wavethat is guided to propagate along the outer surface of the dielectricmaterial of the transmission medium via at least one guided wave modethat includes an asymmetric mode and optionally one or more other modesincluding a fundamental (symmetric) mode or other asymmetric(non-fundamental) mode. The outer surface of the dielectric material canbe the outer surface of an insulating jacket, dielectric coating, orother dielectric. In an example embodiment, the first electromagneticwave generated by the transceiver 1610 is guided to propagate along thecoupler via at least one guided wave mode that includes a symmetric modeand wherein a junction between the coupler and the transmission mediuminduces the asymmetric mode of the second electromagnetic wave andoptionally a symmetric mode of the second electromagnetic wave.

In an example embodiment, the transmission medium 1525 is a single wiretransmission medium having an outer surface and a correspondingcircumference and the coupler 1620 couples the first electromagneticwave to the single wire transmission medium. In particular, the couplingof the first electromagnetic wave to the single wire transmission mediumforms a second electromagnetic wave that is guided to propagate alongthe outer surface of the single wire transmission medium via at leastone guided wave mode that includes at least one asymmetric mode andoptionally a symmetric mode and other asymmetric modes, wherein the atleast one carrier frequency in within a millimeter wave frequency bandand wherein the at least one corresponding wavelength is less than thecircumference of the single wire transmission medium. In one mode ofoperation, the first electromagnetic wave is guided to propagate alongthe coupler via at least one guided wave mode that includes a symmetricmode and a junction between the coupler and the transmission mediuminduces both the asymmetric mode of the second electromagnetic wave and,when present, the symmetric mode of the second electromagnetic wave.

While the prior description has focused on the operation of thetransceiver 1610 as a transmitter, the transceiver 1610 can also operateto receive electromagnetic waves that convey second data from the singlewire transmission medium via the coupler 1620 and to generatedcommunications signals 1510 or 1512, via communications interface 1600that includes the second data. Consider embodiments where a thirdelectromagnetic wave conveys second data that also propagates along theouter surface of the dielectric material of the transmission medium1525. The coupler 1620 also couples the third electromagnetic wave fromthe transmission medium 1525 to form a fourth electromagnetic wave. Thetransceiver 1610 receives the fourth electromagnetic wave and generatesa second communication signal that includes the second data. Thecommunication interface 1600 sends the second communication signal to acommunication network or a communications device.

Turning now to FIG. 17, a diagram is shown illustrating an example,non-limiting embodiment of an electromagnetic field distribution. Inthis embodiment, a transmission medium 1525 in air includes an innerconductor 1700 and an insulating jacket 1702 of dielectric material, isshown in cross section. The diagram includes different gray-scales thatrepresent differing electromagnetic field strengths generated by thepropagation of the guided wave having an asymmetric mode. The guidedwave has a field structure that lies primarily or substantially outsideof the transmission medium 1525 that serves to guide the wave. Theregions inside the conductor 1700 have little or no field Likewiseregions inside the insulating jacket 1702 have low field strength. Themajority of the electromagnetic field strength is distributed in thelobes 1704 at the outer surface of the insulating jacket 1702 and inclose proximity thereof. The presence of an asymmetric guided wave modeis shown by the high electromagnetic field strengths at the top andbottom of the outer surface of the insulating jacket 1702—as opposedvery small field strengths on the other sides of the insulating jacket1702.

The example shown corresponds to a 38 GHz wave guided by a wire with adiameter of 1.1 cm and a dielectric insulation of thickness of 0.36 cm.Because the electromagnetic wave is guided by the transmission medium1525 and the majority of the field strength is concentrated in the airoutside of the insulating jacket 1702, the guided wave can propagatelongitudinally down the transmission medium 1525 with very low loss.

In an example embodiment, this particular asymmetric mode of propagationis induced on the transmission medium 1525 by an electromagnetic wavehaving a frequency that falls within a limited range (such as +25%) ofthe lower cut-off frequency of the asymmetric mode. This cutofffrequency can vary based on the dimensions and properties of theinsulating jacket 1702 and the inner conductor 1700 and can bedetermined experimentally to have a desired mode pattern. At frequencieslower than the lower cut-off frequency, the asymmetric mode is difficultto induce in the transmission medium 1525 and fails to propagate for allbut trivial distances. As the frequency increases above the limitedrange of frequencies about the cut-off frequency, the asymmetric modeshifts more and more inward of the insulating jacket 1702. Atfrequencies much larger than the cut-off frequency, the field strengthis no longer concentrated outside of the insulating jacket, butprimarily inside of the insulating jacket 1702. While the transmissionmedium 1525 provides strong guidance to the electromagnetic wave andpropagation is still possible, ranges are more limited by increasedlosses due to propagation within the insulating jacket 1702—as opposedto the surrounding air.

Turning now to FIG. 18, a diagram is shown illustrating an example,non-limiting embodiment of an electromagnetic field distribution. Inparticular, a diagram similar to FIG. 17 is shown with common referencenumerals used to refer to similar elements.

The example shown corresponds to a 60 GHz wave guided by a wire with adiameter of 1.1 cm and a dielectric insulation of thickness of 0.36 cm.Because the frequency of the wave is above the limited range of thecut-off frequency, the asymmetric mode has shifted inward of theinsulating jacket 1702. In particular, the field strength isconcentrated primarily inside of the insulating jacket 1702. While thetransmission medium 1525 provides strong guidance to the electromagneticwave and propagation is still possible, ranges are more limited whencompared with the embodiment of FIG. 17, by increased losses due topropagation within the insulating jacket 1702.

Turning now to FIG. 19, a block diagram is shown illustrating anexample, non-limiting embodiment of a transmission device. Inparticular, a diagram similar to FIG. 16 is presented with commonreference numerals used to refer to similar elements. The transmissiondevice 1500 or 1502 includes a communications interface 1600 thatreceives a communication signal 1510 or 1512 that includes data. Thetransceiver 1610 generates a first electromagnetic wave based on thecommunication signal 1510 or 1512 to convey the first data, the firstelectromagnetic wave having at least one carrier frequency. A coupler1620 couples the first electromagnetic wave to the transmission medium1525 having at least one inner portion surrounded by a dielectricmaterial, the dielectric material having an outer surface and acorresponding circumference. The first electromagnetic wave is coupledto the transmission medium to form a second electromagnetic wave that isguided to propagate along the outer surface of the dielectric materialvia at least one guided wave mode. The at least one guided wave modeincludes an asymmetric mode having a lower cutoff frequency and the atleast one carrier frequency is selected to be within a limited range ofthe lower cutoff frequency.

The transmission device 1500 or 1502 includes an optional trainingcontroller 1900. In an example embodiment, the training controller 1900is implemented by a standalone processor or a processor that is sharedwith one or more other components of the transmission device 1500 or1502. The training controller 1900 selects the at least one carrierfrequency to be within the limited range of the lower cutoff frequencybased on feedback data received by the transceiver 1610 from at leastone remote transmission device coupled to receive the secondelectromagnetic wave.

In an example embodiment, a third electromagnetic wave transmitted by aremote transmission device 1500 or 1502 conveys second data that alsopropagates along the outer surface of the dielectric material of atransmission medium 1525. The second data can be generated to includethe feedback data. In operation, the coupler 1620 also couples the thirdelectromagnetic wave from the transmission medium 1525 to form a fourthelectromagnetic wave and the transceiver receives the fourthelectromagnetic wave and processes the fourth electromagnetic wave toextract the second data.

In an example embodiment, the training controller 1900 operates based onthe feedback data to evaluate a plurality of candidate frequencies andto select the at least one carrier frequency to be within the limitedrange of the lower cutoff frequency, as one of the plurality ofcandidate frequencies. For example, the candidate frequencies can beselected based on criteria such as: being in a millimeter wave band,having wavelengths greater than an outer circumference of thetransmission medium 1525, being less than the mean collision frequencyof electrons in a conductor that makes up a portion of the transmissionmedium 1525, based on experimental results that indicate the limitedrange of frequencies about the cutoff frequency for a particulartransmission medium 1525 and a selected asymmetric mode, and/or based onexperimental results or simulations.

Consider the following example: a transmission device 1500 beginsoperation under control of the training controller 1900 by sending aplurality of guided waves containing test data at a correspondingplurality of candidate frequencies to a remote transmission device 1502coupled to the transmission medium 1525. The test data indicates theparticular candidate frequency of the signal. The training controller1900 at the remote transmission device 1502 receives the test data fromany of the guided waves that were properly received and determines thebest candidate frequency, a set of acceptable candidate frequencies, ora rank ordering of candidate frequencies. This candidate frequency orfrequencies is generated by the training controller 1900 based on one ormore optimizing criteria such as received signal strength, bit errorrate, packet error rate, signal to noise ratio or other optimizingcriteria can be generated by the transceiver 1610 of the remotetransmission device 1502. The training controller 1900 generatesfeedback data that indicates the candidate frequency or frequencies andsends the feedback data to the transceiver 1610 for transmission to thetransmission device 1500. The transmission device 1500 and 1502 can thencommunicate data with one another utilizing the indicated carrierfrequency or frequencies.

While the procedure above has been described in a start-up orinitialization mode of operation, each transmission device 1500 or 1502can send test signals or otherwise evaluate candidate frequencies atother times as well. In an example embodiment, the communicationprotocol between the transmission devices 1500 and 1502 can include aperiodic test mode where either full testing or more limited testing ofa subset of candidate frequencies are tested and evaluated. In othermodes of operation, the re-entry into such a test mode can be triggeredby a degradation of performance due to an impairment, weatherconditions, etc. In an example embodiment, the receiver bandwidth of thetransceiver 1610 is either sufficiently wide to include all candidatefrequencies or can be selectively adjusted by the training controller1900 to a training mode where the receiver bandwidth of the transceiver1610 is sufficiently wide to include all candidate frequencies.

While the guided wave above has been described as propagating on theouter surface of an outer dielectric surface of the transmission medium1525, other outer surfaces of a transmission medium 1525 including theouter surface of a bare wire could likewise be employed. Further, whilethe training controller 1900 has been described above as selecting acandidate frequency to be within a limited range of the lower cut-offfrequency of an asymmetric mode, the training controller 1900 could beused to establish a candidate frequency that optimizes, substantiallyoptimizes or pareto optimizes the propagation along a transmissionmedium 1525 based on one or more performance criteria such asthroughput, packet error rate, signal strength, signal to noise ratio,signal to noise and interference ratio, channel separation in amulti-channel system, and/or other performance criteria—with or withoutan asymmetric mode and with or without regard to whether the candidatefrequency falls within a limited range of the lower cutoff frequency ofany particular mode.

FIG. 20 is a block diagram of an example, non-limiting embodiment of atransmission device in accordance with various aspects described herein.In particular, a transmission device 2000 is shown (which can include,for example, transmission device 1500 or 1502 or other transmissiondevice) that includes a plurality of transceivers 2020, 2020′ (which caninclude, for example, transceivers 1610 or other transceivers), eachhaving a transmitting device (or transmitter) and/or a receiving device(or receiver) that is coupled to a corresponding waveguide 2022, 2022′and coupler 2004, 2004′. The plurality of couplers 2004, 2004′ (whichcan include, for example the coupler 1620 or other coupler) can bereferred to collectively as a “coupling module”. Each coupler 2004 or2004′ of such as coupling module includes a receiving portion 2010 or2010′ that receives an electromagnetic wave 2006 or 2006′ conveyingfirst data from a transmitting device of transceiver 2020 or 2020′ viawaveguide 2022 or 2022′. A guiding portion 2012 or 2012′ of the coupler2004 or 2004′ guides an electromagnetic wave 2006 or 2006′ to a junction2014 for coupling the electromagnetic wave 2006 or 2006′ to atransmission medium 2002. In the embodiment shown, the junction 2014includes an air gap, however other configurations are possible bothwith, and without an air gap. The guiding portion 2012 or 2012′ caninclude a tapered end 2015 or 2015′ that terminates at the junction2014.

Each electromagnetic wave 2006 or 2006′ propagates via at least onefirst guided wave mode on either the outer surface of the coupler, orwithin the coupler or a combination thereof. The coupling of theelectromagnetic waves 2006 and 2006′ to the transmission medium 2002 viathe junction 2014 forms, generates, couples or induces a plurality ofelectromagnetic waves 2008 and 2008′ that are guided to propagate alongthe outer surface of the transmission medium 2002 via at least onesecond guided wave mode that differs from the at least one first guidedwave mode. The transmission medium 2002 can be a single wiretransmission medium or other transmission medium that supports thepropagation of the electromagnetic waves 2008 and 2008′ along the outersurface of the transmission medium 2002 to convey the first data. Asdiscussed in conjunction with FIG. 17, the electromagnetic waves 2008and 2008′ can have a field structure that lies primarily orsubstantially outside of the transmission medium 2002 that serves toguide the wave.

In various embodiments, the electromagnetic waves 2006 and 2006′propagate along couplers 2004 and 2004′ via one or more first guidedwave modes that can include either exclusively or substantiallyexclusively a symmetrical (fundamental) mode, however other modes canoptionally be included in addition or in the alternative. In accordancewith these embodiments, the at least one second guided wave mode of theelectromagnetic waves 2008 and 2008′ includes at least one asymmetricmode that is not included in the guided wave modes of theelectromagnetic waves 2006 and 2006′ that propagate along each coupler2004 or 2004′. In operation, the junctions 2014 induce theelectromagnetic waves 2008 and 2008′ on transmission medium 2002 tooptionally include a symmetric (or fundamental) mode, but also one ormore asymmetric (or non-fundamental) modes not included in the guidedwave modes of the electromagnetic wave 2006 or 2006′ that propagatealong the coupler 2004 or 2004′.

More generally, consider the at least one first guided wave mode of anelectromagnetic wave 2006 or 2006′ to be defined by the set of modes S1where:

S1=(m11, m12, m13, . . . )

And where the individual modes m11, m12, m13, . . . can each be either asymmetrical (or fundamental) mode or an asymmetrical (ornon-fundamental) mode that propagate more than a trivial distance, i.e.that propagate along the length of the guiding portion 2012 or 2012′ ofa coupler 2004 or 2004′ from the receiving end 2010 or 2010′ to theother end 2015 or 2015′.

Also consider the at least one second guided wave mode of theelectromagnetic wave 2008 or 2008′ to be defined by the set of modes S2where:

S2=(M21, M22, M23, . . . )

And, the individual modes M21, M22, M23, . . . can each be either asymmetrical mode or an asymmetrical mode that propagate along the lengthof the transmission medium 2002 more than a trivial distance, i.e. thatpropagate sufficiently to reach a remote transmission device coupled ata different location on the transmission medium 2002.

In various embodiments, that condition that at least one first guidedwave mode is different from at least one second guided wave mode impliesthat S1 S2. In particular, S1 may be a proper subset of S2, S1 may be aproper subset of S2, or the intersection between S1 and S2 may be thenull set, for example if the media used by the couplers 2004 and 2004′vary from the transmission medium 2002, other otherwise may be null ifthere are no common modes between the sets S1 and S2.

In addition to operating as a transmitter, the transmission device 2000can operate as a receiver as well. In this mode of operation, aplurality of electromagnetic waves 2018 and 2018′ convey second datathat also propagates along the outer surface of the transmission medium2002, but in the opposite direction of the electromagnetic waves 2008and 2008′. Each junction 2014 couples one of the electromagnetic waves2018 or 2018′ from the transmission medium 2002 to form anelectromagnetic wave 2016 or 2016′ that is guided to a receiver of thecorresponding transceiver 2020 or 2020′ by the guiding portion 2012 or2012′.

In various embodiments, the first data conveyed by the plurality ofsecond electromagnetic waves 2008 and 2008′ includes a plurality of datastreams that differ from one another and wherein the each of theplurality of first electromagnetic waves 2006 or 2006′ conveys one ofthe plurality of data streams. More generally, the transceivers 2020 or2020′ operate to convey either the same data stream or different datastreams via time division multiplexing, frequency division multiplexing,or mode division multiplexing. In this fashion, the transceivers 2020 or2020′ can be used in conjunction with a MIMO transmission system to sendand receive full duplex data via one or more MIMO modes such asazimuthal diversity, cyclic delay diversity, spatial coding, space timeblock coding, space frequency block coding, hybrid space time/frequencyblock coding, single stream multi-coupler spatial mapping or other MIMOtransmission/reception scheme.

While the transmission device 2000 is shown with two transceivers 2020and 2020′ and two couplers 2004 and 2004′ arranged at the top and bottomof the transmission medium 2002, other configurations can includediffering orientations of the couplers 2004 and 2004′ such as atorientations of 0 and π/2, or at other angular or spatial deviationswith respect to one another. Other configurations can include three ormore transceivers and corresponding couplers. For example, atransmission device 2000 with four transceivers 2020, 2020′ . . . andfour couplers 2004, 2004′ . . . can be arranged at azimuthally aroundthe outer surface of a cylindrical transmission medium at equidistantorientations of 0, π/2, π, and 3π/4. Considering a further example, atransmission device 2000 with n transceivers 2020, 2020′ . . . caninclude n couplers 2004, 2004′, arranged azimuthally around the outersurface of a cylindrical transmission medium at angles 2π/n apart.

In an embodiment, the transceivers 2020 and 2020′ are configured tomodulate data to generate electromagnetic waves 2006 and 2006′ on theircorresponding couplers 2004 and 2004′. The couplers 2004 and 2004′ areeach configured to couple at least a portion of their correspondingelectromagnetic waves 2006 and 2006′ to the transmission medium 2002. Inparticular, each coupler generates one of the plurality ofelectromagnetic waves 2008 or 2008′ that propagate along the outersurface of the transmission medium 2002 via differing ones of aplurality of guided wave modes.

Consider the guided wave mode of electromagnetic waves 2008 to bedefined by the set of modes S2 where:

S2=(M21, M22, M23, . . . )

And, the individual modes M21, M22, M23, . . . can each be either asymmetrical (or fundamental) mode or an asymmetrical (ornon-fundamental) mode that propagate along the length of thetransmission medium 2002 more than a trivial distance, i.e. thatpropagate sufficiently to reach a remote transmission device coupled ata different location on the transmission medium 2002. Further considerthe guided wave mode of electromagnetic waves 2008′ to be defined by theset of modes S2′ where:

S2′=(M21′, M22′, M23′, . . . )

And, the individual modes M21′, M22′, M23′, . . . can each be either asymmetrical (or fundamental) mode or an asymmetrical (ornon-fundamental) mode that propagates along the length of thetransmission medium 2002 more than a trivial distance, i.e. thatpropagate sufficiently to reach the remote transmission device.

In various embodiments, the condition that the plurality ofelectromagnetic waves 2008 or 2008′ that propagate along the outersurface of the transmission medium 2002 via differing ones of aplurality of guided wave modes implies the particular case where S2≠S2′.In this particular case, S2 may be a proper subset of S2′, S2′ may be aproper subset of S2, or the intersection between S2 and S2′ may be thenull set. By way of further example, the individual modes of S2 and S2′can differ from one other by being of different order or by havingdifferent properties of orientation, rotation, etc.

Consider a case where:

S2=M21

S2′=M21′

And further where M21 and M21′ are both first-order dipole(non-fundamental) modes generated by corresponding couplers 2004 and2004′ arranged at azimuthal orientations of 0 and π/2. In this example,the modes M21 and M21′, while having the same physical mode,nevertheless differ from one another by angular deviation. The angulardeviation between the M21 and M21′ can be exploited in a mode divisionmultiplexing scheme. In particular, symbols generated and sent via modeM21 can share the transmission medium 2002 with symbols generated andsent via mode M21′. The angular deviation between these modes can beused to reduce inter-symbol interference (ISI) between symbols sent viamode M21 and contemporaneous symbols sent via mode M21′. Furtherexamples including several optional functions and features are describedin conjunction with FIGS. 21-23 that follow.

Turning now to FIG. 21, a diagram is shown illustrating example,non-limiting embodiments of electromagnetic distributions in accordancewith various aspects described herein. The electromagnetic distributions2100 and 2102 correspond to particular guided wave modes of a modedivision multiplexing scheme used to convey data via electromagneticwaves, such as 2008 and 2008′ presented in conjunction with FIG. 20. Inthis embodiment, the transmission medium 2002 is in air and includes aninner conductor and an insulating jacket of dielectric material, asshown in cross section. These diagrams 2100 and 2102 include differentgray-scales that represent differing electromagnetic field strengthsgenerated by the propagation of guided waves having differing asymmetric(non-fundamental) modes. As shown, each guided wave has a fieldstructure that lies primarily or substantially outside of thetransmission medium 2002 that serves to guide the wave.

In accordance with these examples, electromagnetic distribution 2100corresponds to a guided wave mode M21 and electromagnetic distribution2102 corresponds to a guided wave mode M21′ generated by correspondingcouplers, such as couplers 2004 and 2004′ of FIG. 20, arranged atazimuthal orientations of 0 and π/2. In this case, the guided wave modesM21 and M21′ correspond to first-order dipoles with differing azimuthalorientations. In particular, the guided wave modes M21 and M21′ eachhave an electromagnetic field strength that varies with azimuthalorientation to the longitudinal axis of the transmission medium 2002.

In the example shown, guided wave mode M21 has an electromagnetic fieldpattern that includes lobes centered about the azimuthal orientations 0and π radians. Guided wave mode M21′ has an electromagnetic fieldpattern that includes lobes centered about the azimuthal orientationsπ/2 and 3π/2 radians.

As previously discussed, the angular deviation between the M21 and M21′can be exploited in a mode division multiplexing scheme. In particular,symbols generated and sent via mode M21 can share the transmissionmedium 2002 with symbols generated and sent via mode M21′. The angulardeviation between these modes can be used to reduce inter-symbolinterference (ISI) between symbols sent via mode M21 and contemporaneoussymbols sent via mode M21′. The azimuthal orientations of the lobes ofguided wave mode M21 (0 and π radians) correspond to local minima of theelectromagnetic field pattern of the guided wave mode M21′. Further, theazimuthal orientations of the lobes of guided wave mode M21′ (π/2 and3π/2 radians) correspond to local minima of the electromagnetic fieldpattern of the guided wave mode M21. The juxtaposition of orientationsof high field strength in one symbol sent via M21 with orientations ofrelatively lower field strength sent via M21′ allow these symbols to besent contemporaneously on the transmission medium 2002, with littleinter-symbol interference.

Turning now to FIG. 22, a diagram is shown illustrating example,non-limiting embodiments of propagation patterns in accordance withvarious aspects described herein. In accordance with these examples,propagation pattern 2200 corresponds to a guided wave mode M21 thatpropagates helically with left-hand (counter clockwise) rotation.Propagation pattern 2202 corresponds to a guided wave mode M21′ thatpropagates helically with right-hand (clockwise) rotation. In this case,the guided wave modes M21 and M21′ can correspond to any asymmetricalelectromagnetic field pattern that varies with azimuthal orientation. Aseach guided wave, for example electromagnetic waves 2008 and 2008′,propagates longitudinally along the transmission medium 2002, theelectromagnetic field pattern rotates uniformly as a function oflongitudinal displacement in the helical pattern that is shown. As such,the electromagnetic field strength of M21 varies helically along thelongitudinal axis of the transmission medium 2002 via a first directionof rotation and the electromagnetic field strength of M21′ varieshelically along the longitudinal axis of the transmission medium 2002via a second direction of rotation.

As previously discussed, the differences in helical propagation betweenthe M21 and M21′ can be exploited in a mode division multiplexingscheme. In particular, symbols generated and sent via mode M21 can sharethe transmission medium 2002 with symbols generated and sent via modeM21′. The couplers in a remote receiving device can be designed andoriented to receive either M21 while attenuating M21′ or either M21′while attenuating M21—reducing inter-symbol interference (ISI) betweensymbols sent via mode M21 and contemporaneous symbols sent via modeM21′.

Turning now to FIG. 23, a diagram is shown illustrating example,non-limiting embodiments of electromagnetic distributions in accordancewith various aspects described herein. In accordance with theseexamples, electromagnetic distributions 2304 and 2306 correspond to aguided wave mode M21 that propagates helically with left-hand (counterclockwise) rotation. Electromagnetic distributions 2300 and 2302correspond to a guided wave mode M21′ that propagates helically withright-hand (clockwise) rotation. In the example shown, guided wave modesM21 and M21′ initially have an electromagnetic field pattern thatincludes lobes centered about the azimuthal orientations 0 and πradians, however other non-fundamental electromagnetic field patternsare likewise possible. While the initial electromagnetic field patternsare initially oriented the same, any angular offset in the range (0-2π)is likewise possible in other embodiments.

As each guided wave, for example electromagnetic waves 2008 and 2008′discussed in conjunction with FIG. 20, propagates longitudinally alongthe transmission medium, the electromagnetic field pattern rotatesuniformly as a function of longitudinal displacement in a helicalpattern. After some time Δt, the electromagnetic field pattern of M21rotates clockwise over an angular displacement ΔΦ₁ and theelectromagnetic field pattern of M21 rotates counter-clockwise over anangular displacement ΔΦ₂. In some embodiments the helical rotations ineach direction are uniform and therefore,

ΔΦ₁=ΔΦ₂

In other cases however,

ΔΦ₁≠ΔΦ₂

For example when the transmission medium is helically stranded in onedirection, helical modes that may have different rotational velocitiesdepending on whether they are produced in the same direction of thehelical strands or against the direction of the helical strands. For aconstant time period Δt, this difference in rotational velocity wouldyield unequal angular displacements ΔΦ₁ and ΔΦ₂.

Turning now to FIG. 24, a diagram is shown diagram illustrating anexample, non-limiting embodiment of a guided wave communication systemin accordance with various aspects described herein. Like the system1550 described in conjunction with FIG. 15, a transmission device 1500receives one or more communication signals 1510 from a communicationnetwork or other communications device that include data and generatesguided waves 1520 to convey the data via the transmission medium 1525 tothe transmission device 1502. The transmission device 1502 receives theguided waves 1520 and converts them to communication signals 1512 thatinclude the data for transmission to a communications network or othercommunications device. The communication network or networks can includea wireless communication network such as a cellular voice and datanetwork, a wireless local area network, a satellite communicationsnetwork, a personal area network or other wireless network. Thecommunication network or networks can include a wired communicationnetwork such as a telephone network, an Ethernet network, a local areanetwork, a wide area network such as the Internet, a broadband accessnetwork, a cable network, a fiber optic network, or other wired network.The communication devices can include a network edge device, bridgedevice or home gateway, a set-top box, broadband modem, telephoneadapter, access point, base station, or other fixed communicationdevice, a mobile communication device such as an automotive gateway,laptop computer, tablet, smartphone, cellular telephone, or othercommunication device.

In addition, the guided wave communication system 1550 can operate in abi-directional fashion where transmission device 1500 receives one ormore communication signals 1512 from a communication network or devicethat includes other data and generates guided waves 1522 to convey theother data via the transmission medium 1525 to the transmission device1500. In this mode of operation, the transmission device 1502 receivesthe guided waves 1522 and converts them to communication signals 1510that include the other data for transmission to a communications networkor device.

The transmission device 1500 or 1502 includes a communications interface(Com I/F) 1600 that receives a communication signal 1510 or 1512 thatincludes data. The transceivers (Xcvrs) 1610 each generateelectromagnetic waves based on the communication signal 1510 or 1512 toconvey the data. The couplers 1620 couple these electromagnetic waves tothe transmission medium 1525 as guided waves 1520 for transmission onthe outer surface of the transmission medium 1525. The transmissiondevice 1500 or 1502 includes a training controller 1900 that optionallyincludes the functionality previously described in conjunction with FIG.19 and further includes additional functions and features as describedherein. The training controller 1900 can be implemented by a standaloneprocessor or processing circuit or a processor or processing circuitthat is shared with one or more other components of the transmissiondevice 1500 or 1502.

In an example of operation, the transceivers 1610 of transmission device1500 are configured to modulate data from the communication signals 1510to generate a plurality of first electromagnetic waves in accordancewith channel equalization parameters and/or other channel controlparameters. The couplers 1620 of transmission device 1500 are configuredto couple at least a portion of the plurality of these firstelectromagnetic waves to a transmission medium, wherein the plurality ofcouplers generate a plurality of second electromagnetic waves as guidedwaves 1520 that propagate along the outer surface of the transmissionmedium. The training controller 1900 of the transmission device 1500 isconfigured to generate the channel equalization and/or other channelcontrol parameters based on channel state information 2404 received fromat least one remote transmission device, such as via the guided waves1522. However, if an alternative communication path exists betweentransmission device 1500 and 1502 this alternative communication pathcould optionally be employed to convey the channel state information2404 to the transmission device 1500. In this fashion, the trainingcontroller 1900 of the transmission device 1500 can modify the operationof the transceivers 1610 to equalize the communication channel betweenthe transmission device 1500 and 1502 formed by the transmission medium1525 to compensate for phase and frequency variations, channeldispersion, scattering, fading and other distortion.

In an embodiment, the guided waves 1520 include training signals 2402.These training signals 2402 can include one or more training fields orsequences or other pilot signals with properties that are known to boththe transmission device 1500 and 1502. These training signals 2402 canbe included in the preamble of general packetized communications sentvia guided waves 1520 or otherwise transmitted in sui generis trainingcommunications. After the training signals 2402 are received by thetransceivers of 1610 of the transmission device 1502, the trainingcontroller 1900 of the transmission device 1502 can generate the channelstate information to feedback channel state information that includeseither raw observations relating to the amplitude and phase of thetraining signals 2402 as received by the transmission device or anestimated channel matrix or other indication of channel estimation basedon an analysis of the received training signals 2402 performed by thetraining controller 1900 of the transmission device 1502. In otherexamples, the training controller 1900 of the transmission device 1502can go further to generate channel state information 2404 that indicatesactual or recommended channel control parameters, such as a modulationtype, bit rate, MIMO mode, frequency band, frequency channels, errorcoding depth, OFDM channels or parameters and/or specific channelequalization parameters such as phase offsets and/or amplitudes to beused by the transmission device 1500 in generating the guided waves1520.

While the foregoing has focused on the channel equalization oftransmission device 1500 based on channel state information 2404received from the transmission device 1502, it should also be noted thatthe transmission devices 1500 and 1502 can operate in a reciprocalfashion to provide channel equalization in the transmission device 1502for the guided waves 1522. In this fashion, similar training signals canbe included in the guided waves 1522 and channel state informationgenerated by the training controller 1900 of the transmission device1500 can be used by the training controller 1900 of transmission device1502 to provide control and/or equalization of its transceivers 1610. Inother embodiments, either transmission device 1500 or transmissiondevice 1502 can perform a reverse channel estimation.

Turning now to FIG. 25 a diagram is shown illustrating an example,non-limiting embodiment of channel parameters in accordance with variousaspects described herein. In particular, an example is shown wheretransmission device 1500 includes m couplers 1620 and transmissiondevice 1502 includes n couplers 1620. In an embodiment,

m=n

however other configurations are possible where the transmission device1500 and 1502 include a different number of couplers 1620.

Considering the equalization and control of the channel fromtransmission device 1500 to transmission device 1502, the m couplers oftransmission device 1500 operate as transmit couplers and the n couplersof the transmission device 1502 operate as receive couplers. Thecharacteristics of the channel can be represented by the equation:

y=Hx+r

where y is a vector of n output signals received via the n couplers oftransmission device 1502, x is a vector of m input signals transmittedvia the m couplers of transmission device 1500, r is a noise vector, andHis an m×n matrix of complex channel parameters h_(ij), where

$H = \begin{pmatrix}{h\; 11} & \ldots & {h\; 1\; n} \\\vdots & \ddots & \vdots \\{{hm}\; 1} & \ldots & {hnm}\end{pmatrix}$

The current channel state can be estimated based on an analysis of thetraining signals. Considering the training signals to be a sequence of aknown input signals p₁ . . . p_(a). Considering the ith training signal,p_(i)

y _(i) =Hp _(i) +r

Considering the output for all the received training signals y_(i) fori=1 . . . a, the total training results can be represented by

Y=HP+R

Where Y=[y₁ . . . y_(a)], P=[p₁ . . . p_(a)] and R=[r₁ . . . r_(a)].Because Y and P are known, the channel matrix H, can be estimated, evenin the presence of noise R, based on a least squares estimation, aBayesian estimation or other estimation technique. Once the channelmatrix H has been estimated, the transmission device 1500 can applyprecoding or filtering in the transceivers 1610 to modify the phaseand/or amplitude of input signals x to compensate for actual channelconditions. In addition, an analysis of the estimated channel matrix Hcan be used to modify the modulation type, bit rate, MIMO mode, errorcorrection code depth, frequency channels, OFDM parameters or otherencoding or control parameters of the transceivers 1610 in order tocompensate for current channel conditions.

Turning now to FIG. 26, a flow diagram is shown illustrating an example,non-limiting embodiment of a method 2600. The method can be used inconjunction with one or more functions and features described inconjunction with FIGS. 1-30. Step 2602 includes modulating data, by atleast one transceiver, to generate a plurality of first electromagneticwaves. Step 2604 includes coupling or directing, by a plurality ofcouplers, at least a portion of each of the plurality of electromagneticwaves onto an outer surface of a transmission medium to generate orinduce a plurality of second electromagnetic waves that propagate alongthe outer surface of the transmission medium, wherein the plurality ofsecond electromagnetic waves propagate via differing ones of a pluralityof guided wave modes.

In various embodiments, the plurality of guided wave modes includes afirst non-fundamental mode and a second non-fundamental mode. Forexample, the first non-fundamental mode can have a first electromagneticfield strength that varies with azimuthal orientation to a longitudinalaxis of the transmission medium and the second non-fundamental mode canhave a second electromagnetic field strength of that varies withazimuthal orientation to the longitudinal axis of the transmissionmedium. The first non-fundamental mode can have a first electromagneticfield pattern that includes a first lobe at a first azimuthalorientation to a longitudinal axis of the transmission medium and thesecond non-fundamental mode can have a second electromagnetic fieldpattern that includes a second lobe at a second azimuthal orientation tothe longitudinal axis of the transmission medium, and wherein the firstazimuthal orientation differs from the second azimuthal orientation. Thefirst azimuthal orientation can correspond to a local minimum of thesecond electromagnetic field pattern and the second azimuthalorientation can correspond to a local minimum of the firstelectromagnetic field pattern.

In various embodiments, the first non-fundamental mode has a firstelectromagnetic field strength that varies helically along alongitudinal axis of the transmission medium and the secondnon-fundamental mode has a second electromagnetic field strength of thatvaries helically along the longitudinal axis of the transmission medium.The first electromagnetic field strength can vary helically along thelongitudinal axis of the transmission medium via a first direction ofrotation and the second electromagnetic field strength can varyhelically along the longitudinal axis of the transmission medium via asecond direction of rotation.

Turning now to FIG. 27, a flow diagram is shown illustrating an example,non-limiting embodiment of a method 2700. The method can be used inconjunction with one or more functions and features described inconjunction with FIGS. 1-26. Step 2702 includes generating channelequalization parameters or other channel control parameters based onchannel state information received from at least one remote transmissiondevice. Step 2704 includes modulating data, by at least one transceiver,to generate a plurality of first electromagnetic waves in accordancewith the channel equalization or control parameters. Step 2706 includescoupling, by a plurality of couplers, at least a portion of each of theplurality of electromagnetic waves onto an outer surface of atransmission medium to generate a plurality of second electromagneticwaves that propagate along the outer surface of the transmission medium.

In various embodiments, the second electromagnetic waves include atleast one training field and wherein the at least one remotetransmission device generates the channel state information based on ananalysis of the at least one training field. The channel stateinformation can include a channel estimate, a selection of at least oneof: a modulation type and a bit rate. The channel equalization or othercontrol parameters can include a plurality of phase offsets and whereinthe at least one transceiver generates the plurality of firstelectromagnetic waves based on the plurality of phase offsets. The atleast one transceiver can operate in a selected one of a plurality ofmulti-input multi-output (MIMO) modes, based on the channel stateinformation. The at least one transceiver modulates the data to generatethe plurality of first electromagnetic waves in accordance withorthogonal frequency division multiplexing that is adapted based on thechannel state information.

Electromagnetic waves as described by the subject disclosure can beaffected by the presence of a physical object (e.g., a bare wire orother conductor, a dielectric, an insulated wire, a conduit or otherhollow element, a bundle of insulated wires that is coated, covered orsurrounded by a dielectric or insulator or other wire bundle, or anotherform of solid, liquid or otherwise non-gaseous transmission medium) soas to be at least partially bound to or guided by the physical objectand so as to propagate along a transmission path of the physical object.Such a physical object can operate as a transmission medium that guides,by way of an interface of the transmission medium (e.g., an outersurface, inner surface, an interior portion between the outer and theinner surfaces or other boundary between elements of the transmissionmedium), the propagation of electromagnetic waves (“guidedelectromagnetic waves”), which in turn can carry energy and/or dataalong the transmission path from a sending device to a receiving device.

Unlike free space propagation of wireless signals such as unguided (orunbounded) electromagnetic waves that decrease in intensity inversely bythe square of the distance traveled by the unguided electromagneticwaves, guided electromagnetic waves can propagate along a transmissionmedium with less loss in magnitude per unit distance than experienced byunguided electromagnetic waves.

Unlike electrical signals, guided electromagnetic waves can propagatefrom a sending device to a receiving device without requiring a separateelectrical return path between the sending device and the receivingdevice. As a consequence, guided electromagnetic waves can propagatefrom a sending device to a receiving device along a transmission mediumhaving no conductive components (e.g., a dielectric strip), or via atransmission medium having no more than a single conductor (e.g., asingle bare wire or insulated wire). Even if a transmission mediumincludes one or more conductive components and the guidedelectromagnetic waves propagating along the transmission medium generatecurrents that flow in the one or more conductive components in adirection of the guided electromagnetic waves, such guidedelectromagnetic waves can propagate along the transmission medium from asending device to a receiving device without requiring a flow ofopposing currents on an electrical return path between the sendingdevice and the receiving device.

In a non-limiting illustration, consider electrical systems thattransmit and receive electrical signals between sending and receivingdevices by way of conductive media. Such systems generally rely onelectrically separate forward and return paths. For instance, consider acoaxial cable having a center conductor and a ground shield that areseparated by an insulator. Typically, in an electrical system a firstterminal of a sending (or receiving) device can be connected to thecenter conductor, and a second terminal of the sending (or receiving)device can be connected to the ground shield. If the sending deviceinjects an electrical signal in the center conductor via the firstterminal, the electrical signal will propagate along the centerconductor causing forward currents in the center conductor, and returncurrents in the ground shield. The same conditions apply for a twoterminal receiving device.

In contrast, consider a waveguide system such as described in thesubject disclosure, which can utilize different embodiments of atransmission medium (including among others a coaxial cable) fortransmitting guided electromagnetic waves without an electrical returnpath. In one embodiment, for example, the waveguide system of thesubject disclosure can be configured to induce guided electromagneticwaves that propagate along an outer surface of a coaxial cable. Althoughthe guided electromagnetic waves will cause forward currents on theground shield, the guided electromagnetic waves do not require returncurrents to enable the guided electromagnetic waves to propagate alongthe outer surface of the coaxial cable. The same can be said of othertransmission media used by a waveguide system for the transmission ofguided electromagnetic waves. For example, guided electromagnetic wavesinduced by the waveguide system on an outer surface of a bare wire, oran insulated wire can propagate along the bare wire or the insulatedbare wire without an electrical return path.

Consequently, electrical systems that require two or more conductors forcarrying forward and reverse currents on separate conductors to enablethe propagation of electrical signals injected by a sending device aredistinct from waveguide systems that induce guided electromagnetic waveson an interface of a transmission medium without the need of anelectrical return path to enable the propagation of the guidedelectromagnetic waves along the interface of the transmission medium.

It is further noted that guided electromagnetic waves as described inthe subject disclosure can have an electromagnetic field structure thatlies primarily or substantially outside of a transmission medium so asto be bound to or guided by the transmission medium and so as topropagate non-trivial distances on or along an outer surface of thetransmission medium. In other embodiments, guided electromagnetic wavescan have an electromagnetic field structure that lies primarily orsubstantially inside a transmission medium so as to be bound to orguided by the transmission medium and so as to propagate non-trivialdistances within the transmission medium. In other embodiments, guidedelectromagnetic waves can have an electromagnetic field structure thatlies partially inside and partially outside a transmission medium so asto be bound to or guided by the transmission medium and so as topropagate non-trivial distances along the transmission medium.

As used herein, the term “millimeter-wave” can refer to electromagneticwaves that fall within the “millimeter-wave frequency band” of 30 GHz to300 GHz. The term “microwave” can refer to electromagnetic waves thatfall within the “microwave frequency band” of 300 MHz to 300 GHz.

As used herein, the term “antenna” can refer to a device that is part ofa transmitting or receiving system to radiate or receive wirelesssignals.

As used herein, terms such as “data storage,” “database,” andsubstantially any other information storage component relevant tooperation and functionality of a component, refer to “memorycomponents,” or entities embodied in a “memory” or components comprisingthe memory. It will be appreciated that the memory components orcomputer-readable storage media, described herein can be either volatilememory or nonvolatile memory or can include both volatile andnonvolatile memory.

In addition, a flow diagram may include a “start” and/or “continue”indication. The “start” and “continue” indications reflect that thesteps presented can optionally be incorporated in or otherwise used inconjunction with other routines. In this context, “start” indicates thebeginning of the first step presented and may be preceded by otheractivities not specifically shown. Further, the “continue” indicationreflects that the steps presented may be performed multiple times and/ormay be succeeded by other activities not specifically shown. Further,while a flow diagram indicates a particular ordering of steps, otherorderings are likewise possible provided that the principles ofcausality are maintained.

As may also be used herein, the term(s) “operably coupled to”, “coupledto”, and/or “coupling” includes direct coupling between items and/orindirect coupling between items via one or more intervening items. Suchitems and intervening items include, but are not limited to, junctions,communication paths, components, circuit elements, circuits, functionalblocks, and/or devices. As an example of indirect coupling, a signalconveyed from a first item to a second item may be modified by one ormore intervening items by modifying the form, nature or format ofinformation in a signal, while one or more elements of the informationin the signal are nevertheless conveyed in a manner than can berecognized by the second item. In a further example of indirectcoupling, an action in a first item can cause a reaction on the seconditem, as a result of actions and/or reactions in one or more interveningitems.

What has been described above includes mere examples of variousembodiments. It is, of course, not possible to describe everyconceivable combination of components or methodologies for purposes ofdescribing these examples, but one of ordinary skill in the art canrecognize that many further combinations and permutations of the presentembodiments are possible. Accordingly, the embodiments disclosed and/orclaimed herein are intended to embrace all such alterations,modifications and variations that fall within the spirit and scope ofthe appended claims. Furthermore, to the extent that the term “includes”is used in either the detailed description or the claims, such term isintended to be inclusive in a manner similar to the term “comprising” as“comprising” is interpreted when employed as a transitional word in aclaim.

What is claimed is:
 1. A transmission device comprising: a plurality ofcouplers configured to receive a plurality of first electromagneticwaves generated in accordance with surface wave channel dispersionequalization parameters and to couple at least a portion of theplurality of first electromagnetic waves to an outer surface of atransmission medium as a plurality of second electromagnetic thatpropagate longitudinally along the outer surface of the transmissionmedium to at least one other transmission device that is remote from thetransmission device, wherein the plurality of second electromagneticwaves includes a first wave having a first electromagnetic field patternthat includes a first lobe at a first azimuthal orientation to alongitudinal axis of the transmission medium and a second wave having asecond electromagnetic field pattern that includes a second lobe at asecond azimuthal orientation to the longitudinal axis of thetransmission medium, and wherein the first azimuthal orientation differsfrom the second azimuthal orientation, and wherein the at least oneother transmission device is configured to receive the plurality of thesecond electromagnetic waves from the outer surface of the transmissionmedium; and a training controller that facilitates generation of thesurface wave channel dispersion equalization parameters based on channelstate information received from the at least one other transmissiondevice to mitigate a channel dispersion of the plurality of secondelectromagnetic waves that propagate longitudinally along the outersurface of the transmission medium.
 2. The transmission device of claim1 wherein the plurality of second electromagnetic waves include at leastone training field and wherein the at least one other transmissiondevice updates the channel state information based on an analysis of theat least one training field.
 3. The transmission device of claim 1wherein the channel state information includes a channel estimate. 4.The transmission device of claim 1 wherein the channel state informationincludes a selection of at least one of: a modulation type and a bitrate.
 5. The transmission device of claim 1 wherein the surface wavechannel dispersion equalization parameters include a plurality of phaseoffsets and wherein the at least one transceiver generates the pluralityof first electromagnetic waves based on the plurality of phase offsetsto further reduce inter-symbol interference.
 6. The transmission deviceof claim 1 wherein at least one transceiver modulates the data togenerate the plurality of first electromagnetic waves in accordance withorthogonal frequency division multiplexing.
 7. The transmission deviceof claim 6 wherein the at least one transceiver operates in a selectedone of a plurality of multi-input multi-output (MIMO) modes.
 8. Amethod, comprising: receiving a plurality of first electromagnetic wavesin accordance with the surface wave channel dispersion equalizationparameters; and coupling, by a plurality of couplers, at least a portionof each of the plurality of first electromagnetic waves onto an outersurface of a transmission medium to generate a plurality of secondelectromagnetic waves that longitudinally propagate along the outersurface of the transmission medium to at least one remote transmissiondevice, wherein the at least one remote transmission device isconfigured to receive the plurality of second electromagnetic waves fromthe outer surface of the transmission medium, wherein the plurality ofsecond electromagnetic waves includes a first wave having a firstelectromagnetic field pattern that includes a first lobe at a firstazimuthal orientation to a longitudinal axis of the transmission mediumand a second wave having a second electromagnetic field pattern thatincludes a second lobe at a second azimuthal orientation to thelongitudinal axis of the transmission medium, and wherein the firstazimuthal orientation differs from the second azimuthal orientation, andwherein the surface wave channel dispersion equalization parameterscontribute to mitigating a channel dispersion of the plurality of secondelectromagnetic waves that propagate longitudinally along the outersurface of the transmission medium; wherein the channel stateinformation is received from the at least one remote transmission devicevia third electromagnetic waves that propagate longitudinally along theouter surface of the transmission medium from the at least one remotetransmission device.
 9. The method of claim 8 wherein the plurality ofsecond electromagnetic waves include at least one sequence of trainingsignals and wherein the at least one remote transmission device updatesthe channel state information based on an analysis of the at least onesequence of training signals.
 10. The method of claim 8 wherein thechannel state information includes a channel estimate.
 11. The method ofclaim 8 wherein the channel state information includes a selection of atleast one of: a modulation type and a bit rate.
 12. The method of claim8 wherein the surface wave channel dispersion equalization parametersinclude a plurality of phase offsets and wherein the at least onetransceiver generates the plurality of first electromagnetic waves basedon the plurality of phase offsets.
 13. The method of claim 8 wherein atleast one transceiver modulates the data to generate the plurality offirst electromagnetic waves in accordance with orthogonal frequencydivision multiplexing.
 14. The method of claim 13 wherein the at leastone transceiver operates in a selected one of a plurality of multi-inputmulti-output (MIMO) modes.
 15. A transmission device comprising: atleast one transceiver configured to generate a plurality of firstelectromagnetic waves in accordance with channel control parameters; anda plurality of couplers configured to couple at least a portion of theplurality of first electromagnetic waves to a transmission medium as aplurality of second electromagnetic waves that propagate longitudinallyalong an outer surface of the transmission medium to communicate thedata, wherein the plurality of second electromagnetic waves includes afirst wave having a first electromagnetic field pattern that includes afirst lobe at a first azimuthal orientation to a longitudinal axis ofthe transmission medium and a second wave having a secondelectromagnetic field pattern that includes a second lobe at a secondazimuthal orientation to the longitudinal axis of the transmissionmedium, and wherein the first azimuthal orientation differs from thesecond azimuthal orientation, and wherein the channel control parameterscontribute to mitigating a channel dispersion of the plurality of secondelectromagnetic waves that propagate longitudinally along the outersurface of the transmission medium; and a training controller configuredto generate the channel control parameters based on channel stateinformation received via a plurality of third electromagnetic waves thatpropagate longitudinally along the outer surface of the transmissionmedium from at least one other transmission device that is remote fromthe transmission device, and wherein the at least one other transmissiondevice is further configured to adapt the at least one transceiver basedon the channel state information.
 16. The transmission device of claim15 wherein the second plurality of electromagnetic waves include atleast one training field and wherein the at least one other transmissiondevice generates the channel state information based on an analysis ofthe at least one training field.
 17. The transmission device of claim 15wherein the channel state information includes a channel estimate. 18.The transmission device of claim 15 wherein the channel controlparameters include a selection of at least one of: a modulation type anda bit rate.
 19. The transmission device of claim 15 wherein the channelcontrol parameters include a plurality of phase offsets and wherein theat least one transceiver generates the plurality of firstelectromagnetic waves based on the plurality of phase offsets tomitigate effects of a distortion in the plurality of secondelectromagnetic waves caused by the transmission medium.
 20. Thetransmission device of claim 15 wherein the at least one transceivermodulates data to generate the plurality of first electromagnetic wavesin accordance with orthogonal frequency division multiplexing.